Re: Mummy the Resurrection
You could have the players meet in game, either introduced by NPCs or drawn together as they discover the problems they're all dealing with are related. Alternately, you could have a quick discussion out of character with the group about how they've met and past interactions.
Unless you want to deal with the extreme difficulty the Amenti have in regaining Sekhem outside the Web of Faith (or create a house rule), I'd say it should be mainly set somewhere in that region. Canonically, I believe the Web of Faith includes the Arabian peninsula, Iraq, Iran, Egypt, the Holy Land, Turkey, Crete and Greece. I would also include the Sudan and possibly Afghanistan and Pakistan. With a stretch, you could count anywhere the Roman Empire spread, since Egyptian gods were worshiped everywhere the Romans spread (figurines of Isis have been found in Britain). Considering the current state of the world, I would say a good portion of the area covered by the Web of Faith would be pretty unplayable with PCs who aren't locals, and are probably places most people wouldn't want to set a game. I wouldn't want to play in a game in some of those places, anyway. I'd suggest Egypt, Turkey, Jordan and possibly Israel -- the first three are fairly stable, friendly to Westerners and relatively safe, and Israel is fairly stable and friendly to Westerners, if not as safe. Greece and Crete could work too, but I don't think they're as thematically linked to the game and they don't appeal to me as much.
Personally, I'd probably just go with Egypt, since it's the iconic setting for the game and easy to research. Turkey would be my second choice since it's a very interesting place.