Welcome to the site :cool:
Be sure and go to your User CP and update information relating to your location, type of riding, etc. After that grab a spot on the couch and tell us a bit about yourself. How long you have been riding, what kind of riding you prefer, where you are located, etc. We will do our best to hook you up with some fellow dirt bike enthusiasts.
AlaskanRider is correct, the 125 class is a good class and the 125 bikes (those that are left) are good to learn on. Dirt Rider Mag said that manufacturers are maling amistake dropping the 1/8 liter bikes and I agree. Inexpensive to own, easy to master, and fun far beyond their size. Bigger is not always better.
Again, welcome to the site and shout if you have any questions!