Welcome to SoM.
There are a lot of covens you can join. If you find one to your liking you can apply.
I agree with RhiSabelle. The 'Fantasy' and 'Tricks' sections are most likely to be fluff work. You see spells to turn into a mermaid or werewolf. Spells won't change your genes, and in my opinion there's no way you can grow a tail in a few days. It's best to avoid those sections.
Unless you have a lot of experience in Wicca or have great qualities about you it's unlikely that a priest or priestess will be interested in you. It's up to you to contact them to apply to their coven.
Apart from that, hopefully you get on well on this site.
Good luck and blessed be