Hey Samantha, I know this sounds like a very odd way to go about it, but when I was in the search for a guild myself here is what I did.
Get onto all the Guild threads here on the forums. There are some really great guilds out there. (Hint hint.

) I have yet to see one who wouldn't love a new member.
Read the guild rules and decide if you can live with them.

If not then keep looking.
When you find a few you like try shooting off a PM to the Guildmaster.

The ones I wrote were very polite and friendly.
See if you can meet up with a few of your perspective guildmates. If you're not sure about the people, move on again. (This is doubtful seeing as I've run into nice people from more guilds than I can count.)
This should lead you to the right guild for YOU. Believe me you'll know when you find it. 5 seconds in was all it took for me to be sure I was a Duece. Wherever you land I hope you find the right guild for you and that you're happy there!
Best of luck in your search mate!