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.
As far as lowering a bike, there are options that discussed throughtout the site. Use search and a bunch will pop up.
I lowered my KTM 200 a total of about 2 inches and am in process of doing the same on my XR650R. The approach is different on each machine you look at.
Again, welcome to the site and shout if you have any questions!