mauser06 - I' m not completely up to date on PA restrictions, I do know they have openned up their regulations a bit, but double check them to make sure which projectiles are legal.
As for what to buy - I' ve got two articles on my site, one covers the guns themselves, the second all the extras. To answer your question it usually is cheaper to buy the " Kit" , if you priced out all the items you' ll get find the kit is normally priced better.
Defineately, hook up with your Dad' s friend and have him walk you through the loading, shooting, and cleaning of you new gun.
Welcome to the sport