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 3:10,23. (See Romans 5:8; 6:23.)

Ask God's forgiveness.
"Everyone who calls on the name of the Lord will be saved."
Romans 10:13

B. Believe in Jesus
(put your trust in Him) 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 (See John 14:6.)

Become a child of God by receiving Christ.
"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