AudiForums.com - 93 audi questions!

Ok so i picked up a 93 audi 100 s 6 cyl. Here are the problems and if anyone can help me with it, i would be happy!
1. it shifts to the first three gears and then nothing after that! Where should i start checking?
2.The engine is a little rough, i can tell there is oil coming from the head gasket, but am having a hard time determining if it's burning oil, how can i tell this? if it is, what is the best course of action with that? rebuild or buy a junk yard one?
3. The power moon roof does not work, i checked the fuses, and they check out, where is the motor located for that? I need to get that fixed before i can take it out of my garage.
4. where is the best place to find a sock exhaust? do these have one cat or two? The y pipe on this one is busted but i only see one cat coming off from the engine on the pass side. so i was curious, where would the best place to find one be? i don't need the whole thing as the muffler is still good, so if there was a replacement i could just easily throw on that would be awesome!

On a final note, I know this car may seem like a POS but i really like it and would love to restore this audi, for the price i paid even if i put 1500 in to it, I'm still making a profit. Any help locating parts or ideas would be awesome! thank you!