public access point

Hy all,

i want to set up an access point to provide internet access in a sailing
club.
I want to provide the service with no charge for affiliates but i want:

1) provide access only to authorized users with a password (WEP?) authorized
user are not only Affiliates but also the team that use the club rooms for
tha many regatas that we organize.
2) track the user trafic to prevent illegal use of the internet.

there's someone that could help me?

Max