Kind of a confused first post, but we'll try to help you out.
First, I prefer the human team. The alien team is too hard for me, or rather, it's too hard for me to play as a Dretch. At least sometimes I can kill something with a rifle.
Which maps are you looking for?
GtkRadiant is used to make the maps, and it might be possible to use Quark, but I am not sure.