Enjoy, Jodysuzanne! Supernatural is my favorite expansion - in fact, it is what sold me on the game.
Moonlight Falls is a pretty good town, too. It has become my usual place to play. Plenty of room to add new community lots, and a pretty sane layout that is easy to navigate.
Also, go into Buy Mode and, using the filters, look at the items that the expansion pack gives you. It isn't just occult-themed items, there are actually so many things you get with Supernatural, it's hard for me to built a house or community lot without them!
But the real feature is the new life-states. Have fun with these!
Watch out for Full Moon, though, especially if you like to garden. Zombies will try to eat your plants if they are outdoors. Then again, a Fairy sim good enough at the Bloom ability can restore these to life.
Have fun! And don't hesitate to ask any questions you run into along the way.