Hi bitterguy....where exactly in PA do you live. I live just north of Pitt in beaver county. Woods to look for is hickory,hophornbeam,elm,white ash,black locust,hard maple,white oak,and there is Osage here n there,and some other species as well. But those mentioned should be the easiest to find(except Osage) n locate and best suited for a novice.
Also you can start out by finding a red oak board from lowes or home depot,or better yet go to a local lumber yard and pick out a straight grained hickory board.
There also might be a piece of wood on my rack with your name on it
Oh..and the only wood id take from a fallen log or tree on the ground is Osage,yew,and maybe black locust.