So far I am only allowed to use the pin brush in Freestyle .Were are the other brushes? Do I have to download them ? If so could someone point me to the site that has them .
Try using latest Blender 2.71 where you can specify your own brush texture image. The Freestyle section of the Blender 2.71 release notes will be a useful information source about textured strokes.
There are two types of brush texture images: textures with and without tips. Textures with tips need to be prepared in a specific arrangement of brush parts. See the info graphics below which shows you what textures with tips look like.
I personally have never seen the Blender version in the screen capture of your post, although I am the main developer of Freestyle for Blender (: