Howdy Dave, I'm originally from PA, Bethlehem area. The most important ingrediant of deer hunting is you. Scouting, and hunting skills. My Uncle was the best PA deer hunter I ever knew. He always got his buck and it was usually an 8 point or better. He was very attentative and very patient. Miserable weather didn't distract him. His best buck was only a few points shy of of B&C which is quite an accomplishment since very few PA bucks live past their 3rd or 4th birthday. Deer hunting in PA is exremely competive, or at least it used to be. I was a tree stand kind of guy but not my uncle. He would pick a natural blind near some promising trails. And if the early morning wait didn't turn up anything he would still hunt which is quite an art if you do it right.
OK, so as far as gun, scope etc. go. This depends a lot on what kind of a shot you expesct. Most PA hunting is fairly close quarters so you probably wont need a 300 WM like a lot of folks out West use. My Uncle used a 308 which is probably the perfect PA deer caliber. Very accurate and will easily get the job done with a little less kick than a 30.06. 30.06 is a good round but for PA I would prefer the the 308 and 30-30's are quite frankly a weak and not very accurate round. You can get a Tikka or Savage for less than $500, both very good rifles. One more thing, wood stocks are real purdy, synthetic stocks get the job done.
As far as scopes go...
DO NOT buy a cheap scope. You dont have to get top of the line, but you would be better off with iron sights than a cheap scope. I once had a cheap scope that sent bullets flying evrywhere but where they were supposed go. Nikon Monarchs and Busnell Elite series are some good scopes, and they run about $300 - $600. On the lower end of the power you'll be looking for 1.5 - 3 and on the upper end 6 - 10. The larger your objective the more light you will gather. I wouldn't use anything less 40mm.
Hunting clothes??? What ever keeps you warm and dry. Deer see in shades of gray and could care less if you're wearing advantage or real tree. Dont forget your head and ears. In Montana I use Merino wool under layer in cold weather. It keeps you warm and comfortable when you're less than dry. Awesome.
Scent??? you cannot ever cover up, mask, or hide your scent, that is all a bunch of marketing garbage. You can minimize it and most importantly know which way the wind is blowing. Remember, on opening day of deer season in PA there will be multitudes of humans in the woods and the deer will be scenting them and you. Figure that into your tactics.
Some good comments on foot wear in other posts. Get some warm dry boots. $100 - $200.
As far as ammo goes... if you dont handload get premium loads. I would recommend Federal or Nosler. And I would definetly recommend Barnes bullets (in the Federal loads) although there are a lot of bullets that will do the job. For Nosler, I would recomend Accubond. 150 gr bullets for 30 cal are ideal.
For sighting in??? Once again it depends... for PA hunting 200 yd zero is good. At 200 yds zero you can hold dead on from point blank out to 250. For Montana I use a 250 yd zero in 270 Win, 7mm Rem Mag and 300 WSM.
For a knife??? I have a Gerber interchangable blade for utility, bone saw and skinning. I think it cost me about $50. But you could do fine with any knife that kept a descent edge.
There is no place in PA I would need a GPS to find my way out of the woods. A good map and map reading skills is all you need. When in doubt, walk down hill until you get to the nearest road.
Happy Hunting, let us know how it goes