Welcome to the site! Glad to heave you.
Joining a coven depends on you as a person, and what you want from the site in general. Many people do fine without a coven and enjoy the site without ever being a part of one. Others enjoy the social aspect and a chance to share personal knowledge with a group- so they join. It's up to you.
If you're looking for some Help, scroll down to the bottom left hand corner and under the "Help" section you'll find links to the FAQs, Newbie Central and Tips. I highly recommend reading through those briefly. The articles and forums are full of information as well.
Best of luck.