You can know for sure you are on your way to Heaven.

First, realize God loves you...

John 3:16  "For God so loved the world, that he gave his only begotten Son, that whosoever believeth in him should not perish, but have everlasting life."

Second, realize everyone is a sinner...

Romans 3:23 "For all have sinned and come short of the glory of God." 

Third, realize sin has a price that must be paid...

Roman 6:23  "For the wages of sin is death; but the gift of God is eternal life through Jesus Christ our Lord."

Fourth, realize Jesus Christ died to pay your price...

Romans 5:8  "But God commendeth his love toward us, in that, while we were yet sinners, Christ died for us."

Finally, pray, Ask Jesus Christ to be your Saviour, and claim His promises of eternal life...

Romans 10:13  "For whosoever shall call upon the name of the Lord shall be saved."

Will you trust the Lord Jesus Christ as your Savior? Will you rely on Him and Him alone to forgive your sin and give you everlasting life in Heaven? If you will, say the following prayer to the Lord (Remember, to do anything other than receiving Christ is to reject Him).

"Lord, I admit that I am a sinner. I don't deserve to go to Heaven. But I believe that you sent your Son, the Lord Jesus Christ, to die on the cross for my sin. I trust Him, and Him alone to forgive my sin, to become my Savior, and to take me to Heaven when I die. Thank you for saving me. In Jesus' Name, Amen."