First, don't expect to win the first few times you go in.
You need experience, and with the rest of your guild as well. Keep playing unrated with your guild, and practice. Figure out what works, what doesn't. And build upon that. That way, you might find a build that can suit your guild. Just don't expect much so soon.
As the post above said, know your hall inside and out, as well as others. While playing unrated, you can go around and check out other maps. Doesn't matter if you are dying, you're learning, right? Know how to put a team together, how to play together.
Good luck.
