Jesus has been healing people in Capernaum, at the end of the Sabbath. This is the town of Peter and Andrew, in the region of Caesarea. The next day he slips away....
Mark 1: 35-39, Slipping out before dawn
Very early in the morning, while it was still dark, Jesus got up, left the house and went off to a solitary place, where he prayed. 36 Simon and his companions went to look for him,
37 and when they found him, they exclaimed: “Everyone is looking for you!”
Jesus gets away from the crowds by walking in the dark before dawn. This would not have been easy and probably required some knowledge of the area, but certainly guaranteed solitude. Eventually, after dawn, he is missed by Peter and others. Apparently a lot of people are still looking for healing.
Mark 1: 38-39, The ministry begins
39 So he traveled throughout Galilee, preaching in their synagogues and driving out demons.
After healing Simon's mother-in-law and many in the community of Caesarea, Jesus begins a more general ministry throughout Galilee (northern Israel.) The ministry begins with Jesus isolated and praying. (Why does God need to pray?)
Where does Jesus preach? What are the results? (Why?)
As is typical of this gospel, the story moves on quickly, leaving out details.