You answered YES to the most important question in life! The Bible tells us that we CAN know for sure that we're going to heaven! Take a look:
"These things have been written to you that you may KNOW that you have eternal life" 1 John 5:13
Now here's the second question:
Suppose you were to die tonight and stand before God and He were to say to you, "Why should I let you into My heaven?" What would you say?
I've tried to live my life good.
I'm basically a good person.
I've gone to church all my life.
I don't deserve to go anywhere else.
I've tried to live my life by the 10 Commandments.
I cannot enter Heaven on my own, I need help.
I don't know what I would say.