Axel, glad you rethought our advice and embraced it.
Other posters are right.
First - Look over the profiles of guilds in your world. See how well they present the key features and goals of the guild, and what they ask of you to be a part of that.
Second - if you have questions on how they operate, write to leadership (founder or named contact in the profile) and ask them what's on your mind. Make sure you're satisfied with the answer you receive. They have to be happy with you playing with/for them, and you have to be happy too.
I can guarantee you will find what you're looking for. Generally, you want the following:
1) A guild that has a robust 1.9
2) A guild that has both members senior to you in both era and playing time
3) A guild that makes reasonable requirement for guild team activities (such as GE or GbG or GvG) that you can enjoy doing, or not - as you see fit. If it's a laissez-faire type of guild (relaxation...) then you don't have any commitments. If there are though, don't join a guild that makes you over commit to playing a team sport (GE or GbG) that you can't deliver on. Your credibility is based on your commitment and responsibility, and it's is important.
It's like finding the right job. You want a challenge, you want to have mentoring and good advice resources, and you want to help create team wins by participating with like minded people.