Good question. If you want to be federation affiliated (BASS or FLW), you need to register the club with them. However, you do not have to have a federation affiliation. My suggestion would be to start by getting a group of guys together and then take it from their. If you want to join an existing club, contact the SC Bass Federation:
Their website is:
http://www.scbassfed.org/This is their handbook it has federation contacts and list the names of bass clubs in SC, but no club contacts. You could always google each club name, but it might be quicker to give someone at the Federation a call, as they will know which clubs are close by you:
SC FED HANDBOOK