Hey whats up, im 18 years old, have been out to dumont a couple times (goin again pres. day weekend) with my friend and her family and loved it. But now im lookin to buy a bike and hopefully get some info here about which to buy, even though i kinda have an idea. (WR450F) ;)
Check out the SoCal Wrecking Crew forum for ride opportunities in your area. Watch out for the CHIP in the pink tutu. He will ticket you if you are not keeping up on rides.
regarding looking for a bike, use the search function in the What Bike Do I Get... ? forum and you will find mind boggling levels of information.
Again, welcome to the site, and shout if you have any questions!