Thank you for your question.
Jesus’ instructions to his apostles:
Mark 16:15 And he said unto them, Go ye into all the world, and preach the gospel to every creature. 16 He that believeth and is baptized shall be saved; but he that believeth not shall be damned.
From this the sequence is:
At Pentecost when the Jews asked Peter what they were required to do:
Acts 2:37 Now when they heard this, they were pricked in their heart, and said unto Peter and to the rest of the apostles, Men and brethren, what shall we do? 38 Then Peter said unto them, Repent, and be baptized every one of you in the name of Jesus Christ for the remission of sins,
Baptism then is for the remission of our sins so it follows that we must recognise our sins and turn from them before baptism. So to our sequence, between believing and baptism, we need to add repent.
From this the sequence is:
Baptism by immersion in water is an essential beginning to salvation.
Matthew 3:15 And Jesus answering said unto him, Suffer it to be so now: for thus it becometh us to fulfil all righteousness. Then he suffered him.
Baptism in the case of the Philippian Jailer:
Acts 16:30 And (he) brought them out, and said, Sirs, what must I do to be saved? 31 And they said, Believe on the Lord Jesus Christ, and thou shalt be saved, and thy house. 32 And they spake unto him the word of the Lord, and to all that were in his house. 33 And he took them the same hour of the night, and washed their stripes; and was baptized, he and all his, straightway.
Baptism in the case of the Samaritans:
Acts 8:12 But when they believed Philip preaching the things concerning the kingdom of God, and the name of Jesus Christ, they were baptized, both men and women.
What we believe is termed ‘faith’ and has one source – scripture.
Romans 10:17 So then faith cometh by hearing, and hearing by the word of God.
The ‘Gospel’ consists of the things concerning the kingdom of God, and the name of Jesus Christ.
If we think the kingdom of God is in heaven and we have an immortal soul which goes there at death, we need to re-examine the Bible and start again.
Baptism is total immersion in water with the understanding that it is (1) for remission of sins and (2) a symbolic burial of the old man and a rising again to a newness of life.
Acts 22:16 And now why tarriest thou? arise, and be baptized, and wash away thy sins, calling on the name of the Lord.
Romans 6:4 Therefore we are buried with him by baptism into death: that like as Christ was raised up from the dead by the glory of the Father, even so we also should walk in newness of life.
To our sequence we need to add ‘walk in newness of life’.
Our sequence now is:
Paul gives this advice
Romans 6:19 I speak after the manner of men because of the infirmity of your flesh: for as ye have yielded your members servants to uncleanness and to iniquity unto iniquity; even so now yield your members servants to righteousness unto holiness.
Romans 12:1 I beseech you therefore, brethren, by the mercies of God, that ye present your bodies a living sacrifice, holy, acceptable unto God, which is your reasonable service.
Peter gives the same advice
1Peter 4:1 Forasmuch then as Christ hath suffered for us in the flesh, arm yourselves likewise with the same mind: for he that hath suffered in the flesh hath ceased from sin;
2 That he no longer should live the rest of his time in the flesh to the lusts of men, but to the will of God.
We will be saved only if we endure to the end of our lives.
Matthew 24:13 But he that shall endure unto the end, the same shall be saved.
Salvation has to be worked out with fear and trembling.
Philippians 2:12 Wherefore, my beloved, as ye have always obeyed, not as in my presence only, but now much more in my absence, work out your own salvation with fear and trembling.
Paul was aware that even he could fall away.
1Corinthians 9:27 But I keep under my body, and bring it into subjection: lest that by any means, when I have preached to others, I myself should be a castaway.
To walk in newness of life entails the following:
Change the way we think.
Romans 12:2 And be not conformed to this world: but be ye transformed by the renewing of your mind, that ye may prove what is that good, and acceptable, and perfect, will of God.
Live by the spirit – that is - the commandments of Christ and not our own natural desires.
Galatians 5:22 But the fruit of the Spirit is love, joy, peace, longsuffering, gentleness, goodness, faith, 23 Meekness, temperance: against such there is no law. 24 And they that are Christ’s have crucified the flesh with the affections and lusts. 25 If we live in the Spirit, let us also walk in the Spirit.
Live by Faith.
James 2:14 What doth it profit, my brethren, though a man say he hath faith, and have not works? can faith save him? 15 If a brother or sister be naked, and destitute of daily food, 16 And one of you say unto them, Depart in peace, be ye warmed and filled; notwithstanding ye give them not those things which are needful to the body; what doth it profit? 17 Even so faith, if it hath not works, is dead, being alone. 18 Yea, a man may say, Thou hast faith, and I have works: shew me thy faith without thy works, and I will shew thee my faith by my works.
Add to our faith.
2 Peter 1:5 And beside this, giving all diligence, add to your faith virtue; and to virtue knowledge; 6 And to knowledge temperance; and to temperance patience; and to patience godliness; 7 And to godliness brotherly kindness; and to brotherly kindness; love. 8 For if these things be in you, and abound, they make you that ye shall neither be barren nor unfruitful in the knowledge of our Lord Jesus Christ. 9 But he that lacketh these things is blind, and cannot see afar off, and hath forgotten that he was purged from his old sins. 10 Wherefore the rather, brethren, give diligence to make your calling and election sure: for if ye do these things, ye shall never fall:
Live by love.
ASV 1 Corinthians 13:4 Love suffereth long, and is kind; love envieth not; love vaunteth not itself, is not puffed up, 5 doth not behave itself unseemly, seeketh not its own, is not provoked, taketh not account of evil; 6 rejoiceth not in unrighteousness, but rejoiceth with the truth; 7 beareth all things, believeth all things, hopeth all things, endureth all things. 8 Love never faileth:
1 Corinthians 13:13 But now abideth faith, hope, love, these three; and the greatest of these is love.
We will be judged on the love we have shown to others.
Matthew 25:40 And the King shall answer and say unto them, Verily I say unto you, Inasmuch as ye have done it unto one of the least of these my brethren, ye have done it unto me.
Matthew 25:45 Then shall he answer them, saying, Verily I say unto you, Inasmuch as ye did it not to one of the least of these, ye did it not to me.
Luke 18:1 And he spake a parable unto them to this end, that men ought always to pray, and not to faint;
James 5:16 Confess your faults one to another, and pray one for another, that ye may be healed. The effectual fervent prayer of a righteous man availeth much.
I hope this helps.