Wanting to build several multiplayer games

As the title says, I am hoping to build a few multiplayer games in flash. What I have to work with a a BlueHost server which only allows around 20% server usage per domain name and 25 simultaneous MySql connections. I am expecting 50 to 100 users online at once.

My biggest question is what is the best way to connect the users in flash without using a bunch of mysql connections or an FMS server…or is one of those going to have to be used? If not, what approach should I take?