Here is the Good News.

John 3:3 King James Bible

3 Jesus answered and said unto him, Verily, verily, I say unto thee, Except a man be born again, he cannot see the kingdom of God.

The word repentance means 'a change of mind', so you are changing your mind from unbelief to belief in the Good News of the Gospel. It's not about what we do, it is about what Jesus Christ has done, his death, burial and resurrection, believing from the heart, trusting in the blood. Faith alone in Christ alone. 

Ephesians 2:8-9 King James Bible

8 For by grace are ye saved through faith; and that not of yourselves: it is the gift of God:

9 Not of works, lest any man should boast.

This is the Good News of the Gospel.

The Resurrection of Christ: 1 Corinthians 15:1-4 King James Bible

1 Moreover, brethren, I declare unto you the gospel which I preached unto you, which also ye have received, and wherein ye stand;

2 By which also ye are saved, if ye keep in memory what I preached unto you, unless ye have believed in vain.

3 For I delivered unto you first of all that which I also received, how that Christ died for our sins according to the scriptures;

4 And that he was buried, and that he rose again the third day according to the scriptures:

The Message of Salvation to All: Romans 10:9-10 King James Bible

9 That if thou shalt confess with thy mouth the Lord Jesus, and shalt believe in thine heart that God hath raised him from the dead, thou shalt be saved.

10 For with the heart man believeth unto righteousness; and with the mouth confession is made unto salvation.

The Reason Why our Lord Jesus Christ Died for Us.

Romans 3:25 King James Bible

25 Whom God hath set forth to be a propitiation through faith in his blood, to declare his righteousness for the remission of sins that are past, through the forbearance of God;

AND:

Romans 5:11 King James Bible

11 And not only so, but we also joy in God through our Lord Jesus Christ, by whom we have now received the atonement.