Recently set up a wireless network for a friend and her daughter using AOL and it was quite simple to do. Normally you can choose more than one username for AOL broadband accounts, so create another username and password, (create before you install network, via dialup or another computer) store them in the router, set up security details and away you go. Both users can log into thier own acocunts, without seeing the others emails etc.
Search for AOL and wireless and Im sure you should find some good tips out there. I found the new username method as the easiest way. One tip though, keep the username at 6 characters. Dont know why, but it worked with 6 not 7 or 5.
As for AOL helpdesk, dont bother unless you really really have to. They told my friend to reset her router, when it was the BT exchange that had the fault. Now gotta go and reinstall it all again.