How to become a Christian
Admit your sins before God and truly say sorry to Him for them. Ask God to forgive you, to save you from the punishment of sin- death and Hell. Make a decision to change and to start living as God wants. Put right any wrongs you have done to others.
Surrender your life to God. Decide that, from this time on, you will no longer live your life for yourself, but will allow Him to lead you.
Thank Jesus for taking the punishment for your sins, by dying in your place on the cross. Thank Him for the fact that He overcame death and that He promises eternal life to all those who put their trust in Him.
Ask God to fill you with His Holy Spirit. The Holy Spirit is God Himself filling you and giving you the power to live a godly life. He brings an assurance that you have a restored relationship with God. He will help you to see that God is now your loving Father. The Holy Spirit will also help you to communicate with God by giving you spiritual gifts. You can read about this in 1Corinthians chapter 12.