Testifying at church is foundational whether in the worship service or the youth meeting. In time, begin to witness or acknowledge the Lord to people you meet when you are out and about. Go to three or four different locations and wish them a good day in the Lord or give some other acknowledgment. If you are complimented for something, tell them the Lord helped you to do it. As with Bible reading, start at some level you can maintain faithfully and not get overloaded.
Consistency is important.
Don't bite off more than you can chew. Don't Testify Above Your Experience Keep humble and honest. You must tell what the Lord has done for you and how he has changed your life. But you do not want to testify beyond what he has done and tell of some victory in your life that has not occurred yet. That is giving undue attention to yourself.