No no no, bad idea!
Dont put new parts on the bike, your just learning. Your most likely going to smash up the rims, handlebars may bend (My handlebars broke completely while I was at the local park, it sucked ;P. I forget what they were but it was like, SNAFU or somethin' like that..)
Oh yah, after you've got a few tricks down or your getting pretty good, then change out the parts.
Concussion on Saturday (May 30th), all my words are mumbled or I cant write for shit, so ignore my crappy text now.
Wear a damn helmet.. its well worth it..