Pretty much all RP guilds I´ve been in or interacted with closely accept new RPers. It all however depends on what race/class you´d like to RP, what type of RP you´d like to take part in (more casual, or focused on events, adventurers or military and so on).
Now for the part where I shill my own guild: Azure Dawn has lots of cool RPers (the coolest being me, naturally) and fun events, so if you´d be interested in RPing a high or void elf, you can give us a look.