Help with a flash problem (client-server)

Hello everyone…
I am looking for code or tutorials on the following:
-How to setup a Flash server on my server.
-Comunicate with that server from a flash client program.
-Send info from that server to another client (flash program).

The main idea is to practice, increase knowledge and maybe create something nice like a game.

Any help, sugestion, hint will be welcome.
Cheers.
Leo.