The Bible tells us noting of Jesus’ life from the time he returns to Nazareth after the Finding in the Temple until he is baptized by John The Baptist. And for that, it only says he came out of Nazareth
Baptism was not something new; rather John used the Mikvah, a traditional Jewish ritual bath, as a re-birthing much as many Christians see Baptism today. And so, Jesus is baptized and God says he is pleased with His son.
And there is an infinite amount here which we can speculate and imagine about.