Hi Sal,
From where you are, I think the closest flying field is on the State
Game Lands over by Bavington off of 22/30. The club that flys there is Greater Pittsburgh A.R.C.S. The flying field is open to the public. From my experience visitors are always welcome, though you will need AMA membership to fly there. Here is a link to the club website. There is a map and directions to the field there as well as other good info on the club. I'm a newbie myself and I've
found the people out there to be more than helpful. Thursday night is beginner night at the field and that is when you would be most likely to find an instructor a the field.

Hope to see you out there,

Mike