Brie,
Like Jerry says, the first test is to get it running, hit each gear position to see how it feels & sounds, top off the fluid and then see how it performs. Chances are the seals are going to be dried out, but you may get lucky and a little exercise softens them up enough. If you do decide to go through it ask around and find the independent, no name tranny shop where the mechanics take cars. Not many mechanic shops tackle transmissions either, and they know who fixes them right because they are going to be the guy guaranteeing the tranny guy's work. I doubt it will be one of the national chains. Around here it's Olathe Transmission, hidden back on an old feeder street, tall metal building with lots of "stuff" scattered around but about every shop in the area takes Paul their transmissions. He's the guy you can tell, "Just fix it" and he'll do what it needs to be right, and nothing more.