HOW DO I ASK JESUS INTO MY HEART?

That phrase is not found anywhere in the Bible.

HOW DO I SAY THE SINNER'S PRAYER?

There are no examples in the Bible of the "sinner's prayer" to become a Christian. Trace what people in the Apostles' time did to be saved in the following scriptures:

Acts 2:36-42

Acts 8:4-12

Acts 8:26-39

Acts 10:1-48

Acts 16:13-15

Acts 16:23-34

Acts 18:7-8

Acts 22:1-16