>I know where it is started and my questionis do you have to
>do eveything the dude asks to see the reward or is their
>incremental rewards for accomplishing the individual things he
>asks?

Depending on which quest you're asking about, it could be either. If it's the one I think you're thinking of, the bulk of it is definitely at the end.

>also does being in a group hurt you when your doing it.

In terms of quest completion it shouldn't. I want to say if you're there fighting when something dies that's good enough.