I assume it`s NTL Dial up on a BT ADSL line. If so the answer is no - you don`t need anything else. Certainly not from AOL, They`ll charge you for anything including advice and support. The classic is they will insist you`re on their Gold Service to allow wireless connections. Bunkum!
Just remember that you need to enter your username as [email protected] in full in the router.