Repent of Your Sin
That means turning away from your sin and asking God to forgive you for breaking His law.
Luke 13:3 I tell you, Nay: but, except ye repent, ye shall all likewise perish.

Refuse Your Own Self-Effort
Realize that there is no way you can work your way to heaven or somehow be "good enough" to earn heaven.
Ephesians 2:8-9 For by grace ye are saved through faith and that not of yourselves: it is the gift of God: not of works, lest any man should boast.

Rely on Jesus Christ as Your Only Hope
Trust in Jesus, like you would trust a parachute if you were jumping out of an airplane. You wouldn't just believe in the parachute, you would put it on (trust it) and jump (act on it). That is how we must put our faith and trust in Jesus as our only hope of heaven.
Acts 4:12 Neither is there salvation in any other: for there is none other name under heaven given among men, whereby we must be saved.

Receive Jesus Christ as Your Savior and Lord
Today with all your heart, turn away from your sin, and surrender your life to Jesus Christ. Please don't put it off. You may die today and then it will be too late. Put your faith and trust in Him today.
John 1:12 But as many as received him, to them gave he power to become the sons of God, even to them that believe on his name: