I'd recommend starting with
http://wiki.project1999.com/Guilds:Guild_List. It lists every guild on the server (except the really minor ones), and it groups them into general categories.
Right now you're at the "Casual Guild" level. Raid guilds generally require you to have at least one raid-level character (45+, maybe a little lower if you're a cleric). This is because you can't enter some raiding zones without that level. Meanwhile Top Content Raid guilds require even higher levels.
So, your options are to either join a casual guild, where you can certainly find help with epics and other quests, or to gain a few more levels and join a raid guild (which can help you with those things also, but will also let you go on raids and acquire better gear). It just comes down to whether you ever want to raid or not.
If you ever do want to get into raiding there are lots of great guilds, but personally I'd recommend Anonymous, as we take a more casual approach to raiding and also teach new members how to raid.