If your not lvl 90 yet it would be a good idea to get into a guild before then for the 2k guild points and free purp egg you get . It would be best to just do a world shout that you are looking for a guild. Im sure you will get picked up by someone. If you dont want to do that here are some guilds that I know about and would be a good place to start looking.
I am in Violators. Kinda casual pve/pvp guild with a mixed bag of players that are on at different times of the day. We are in an alliance with Systematic currently.
Systematic is a nice guild as well. However, they are more PVP driven.
http://community.adeptgamer.com/threads/guild-systematic-pve-pvp.467/#post-1181
NothingToLose is a newer guild on this server. You might have seen them running all around on the EU server. Still ran by Koda in his mankini.
I know they have some others as well but overall I don't know much about them.