Ive just got my first BMX a Haro Backtrail X24. Im old and too fat and havnt a clue how to do anything on this bike as I have had years of riding MTB and roadbikes. I dont know anyone else who rides a BMX as Im old (29) everyone I know drives everywhere. are there any decent sites with guides (pics would be nice) on how to do the basics? bunny hop, grinds, wheelie? also can I grind anything ie. brick walls or should I just grind metal rails?