ok, wow... umm, well, I believe that you could plug your guitar into a home theater, but you'd probably need to head over to radioshack and get some kind of adaptor for the guitar cable.

there's plenty of guitar tab websites, do a google search on fingerstlye guitar tabs... or something like that. or, use either powertabs (already mentioned, it is the best but you have to downlad something before you can use it) www.guitartabs.cc and I think www.olga.net is a good one too.

as for the preamp, I'd head over to the ibanez website, click on "parts" choose the year and model number of your guitar, and they should have the preamp on there... not sure how to order one from them, but you could at least find what you want.

I don't see why you couldn't use the pickups

and i would not use car polish to get rid of the scratches, I'm not very knowledgable in guitar finishes, but that might do more harm then good. they do make polishes made just for guitars that you should be able to find at your local guitar store for a couple bucks though.

hope that helps!