To know God and be ready for heaven,
follow these steps:

A.    Admit you are a sinner.
"There is no one righteous, not even one ... for all have sinned and fall short of the glory of God."   Romans 3:10 and Romans 3:23 

Simply ask for God's forgiveness for any wrong in your life.   The scripture tells us "Everyone who calls on the name of the Lord will be saved."  Romans 10:13

B.    Believe in Jesus
Put your trust in Christ as your only hope of salvation.
"For God so loved the world that he gave his one and only Son, that whoever believes in him shall not perish but have eternal life." John 3:16

Become a child of God by believing Christ died on the cross and rose again from the grave for your sins and you are now His child.  "To all who receive him, to those who believed in his name, he gave the right   to become children of God." John 1:12 (See Revelation 3:20.)

C.    Confess that Jesus is your Lord.
"If you confess with your mouth, 'Jesus is Lord,' and believe in your heart that God raised him from the dead, you will be saved." Romans 10:9

Confess with your mouth by witnessing to others that you believe Christ in your heart.