Since the survivors will likely be moving into a Safe-Zome this season or next, I figured this would be an interesting topic. In the GN, each character was assigned a job when the group arrived in Alexandria. It was a really cool way to show off each character's strengths.
I would expect it to go like this:
Rick, Michonne- police officers
Glenn, Maggie- supply runners
Tyreese- construction worker
Daryl, Tara- Maybe go out looking for survivors like Aaron and Eric?
Beth- The next half of the season should clear this up, but right now I don't know.
Carl- I really think Rick might want him to have a job of some sort. Perhaps going out with Daryl or Glenn?