@ Lady Kitty
Finding a "porridge just right" guild that meets your needs is like finding the right job in real life. As Agent suggested, look at the Guild rankings. As you look that those guilds, study their guild profiles. Since many of them don't asnwer all your questions, find ones that kinda, sorta piques your interest from what they do post. Study what they OFFER YOU, and what your requirements are to participate with them.
Then - write to the founders with your questions, and see who responds with answer that meet your needs/interests.
Then ask for an invite (or just join) and see how the experience fits. If it doesn't - thank them for the opportunity, and move on to something hopefully better.