Got my first bike on Monday, was messing around in the driveway tonight going from neutral -> first, stopping, backing up, going again, just getting the feel for the bike

Anyways - I think the bike may be low on gas but I'm not quite sure since I have no idea if the fuel gauge is functioning properly. After a while of doing this amazingly fun stuff in the driveway it kept stalling out on me in first gear. Bike has idle issues too so I'm not sure; I'll gas it up tomorrow to be sure.
Long story short - I tried turning the petcock to reserve, with no luck. The thing would NOT budge. I did this with my fingers - didn't try pliers yet but it looks like it had been manipulated with pliers before (dents all over it). Is it normal to be this hard to turn? Do I need to take this thing apart and clean it, or perhaps replace it?
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