I would say a decent sized group would be anywhere from 4-7.. and considering this one's large enough to split two of us off every so often I would say there's probably 4-5 other people. Just as a general idea. We could do 4 and just control them 2/2

As for professions I'm sure you can make a decent guess. You're looking mostly at profiteering mercenaries and the like, people who think they can turn a better coin fighting monsters than people. The occasional merchant might be involved, maybe a historian or a collector of rare and magical baubles.