God is three, yet God is one. You can't lose your salvation. You are not perfect when you are saved. You are just saved by grace. Sinner still, but your belief in Jesus gets you to heaven.
Prayer is powerful.
When you pray to God, talk to Him as you would a friend. Tell Him everything, even though He already knows. He just wants you to ask. You are now a child of God. If you don't listen to God, you can expect punishment.