First, you need some characters. It is helpful if you post them in the
Biographies or create a nifty character site like
this one, to keep track of relations and everything. If you are wondering what to use in the creation of your character, the site provides a little
character form that covers anything you could possibly think of! You don't have to use it, though, you can make your own.
Next if to take that character and head over to
Character Resources to either create a finder for your character or look to other's finders to see if your character will fit the role, you can also create an all-new character to fit a specific role if you'd like. If you'd like to go a more organized route there is also the
Plot Resources where you can post your own plot or, yet again, join another user's if they accept you.
If you are having difficulties with creating a character, you can adopt or have another user help create a cat in
Adoption Acres.
I hope this helps :/ I'm not staff or anything but this is all the stuff I wish I had known when I first joined. If you have questions, you can probably ask anyone on the site and get an answer, things become pretty simple when you get the hang of things.