The First Disciples, Reflection on Mark 1:16-20

They were going about their daily routine when Jesus saw them. When he said to them, "Come after me," they dropped what they were doing (note: their means of earning a living), and followed him.

Questions to consider: Had they heard of him before he showed up at work that day?
Was he looking for them specifically, or would anybody he chose have been able to be his disciple, merely because he chose them?
What does "come after" mean--do you interpret the term literally, metaphorically, or both?
Same question about "followed."
Does discipleship have to mean leaving what we're doing, or can we be disciples in place?
Why did Jesus not mention any rewards?
Mark says that they left their father behind--is that implied in discipleship?