There are a lot of great tools to help you find a good roleplaying site. For example, RPG Directory has many forums full of great sites. You can also Google topsites to find active sites.
Try googling your favourite genre, or google the genre. For example, "human topsite roleplay" or "wolf roleplay" are good queries to start out with.
Many forum-based roleplaying sites have affiliates and advertising boards as well. Click around and see if you can find any you like.
If you're really stuck, you can register at a roleplaying resource forum and request a roleplay recommendation.
One thing that you might want to start with are checking out free roleplay game sites that have already been created, to get ideas, or just to host your game instead. Several are listed in the related links area. If you don't want to put a lot of work into making your own, there are several sites out there that allow you to host your game for free.
If you look at the sites that already exist, and still want to make your own, there are some good links below that discuss some of the concerns you will have to address.
It can be found only in fanfiction and roleplaying sites.
You cant, bluexephos is a roleplaying lets play
Go to the boards and it's under roleplaying.
The Metabarons Roleplaying Game happened in 2001.
Pathfinder Roleplaying Game happened in 2009-08.
Dimension Number 2 is a very unique Pokemon roleplaying website made by a friend of mine. I would highly recommend anybody to check it out. There's even a great community.Coloholics Anonymous is a really big roleplaying website with lots of RPG's. It has some good Pokemon Roleplaying Projects so be sure to check out the anime section:
DC Universe Roleplaying Game happened in 1999.
Amber Diceless Roleplaying Game happened in 1991.
Marvel Universe Roleplaying Game happened in 2003.
The Lord of the Rings Roleplaying Game happened in 2002.
wikipedia.org