You can find a lot of good information just by reading through the archives on this forum. In particular, read
Dynasty's posts on this forum, going back about six to eight months. (Further than that, information gets out of date.)
Just about any hotel with a poker room will give you the casino rate if you make your room reservation through the poker room. They will give you a tracking card which you get initialled each time you play; they generally expect 6-8 hours of play per day. The poker-rates for Strip hotels are probably $50-$100 per day. Weekends are higher than weeknights. Bellagio is quite a bit higher than the rest, $129 weeknights, $199 weekends. But it's worth it if you appreciate nice hotels.
As for your other question, a $750 bankroll is not enough to play 6-12. It would not be especially unusual to lose $750 in three or four hours at 6-12. You should stick to 3-6. Even there, keep in mind that you might lose $750 in a day or two, even if you play pretty well. If you're only going for a weekend that's okay, as long as the $750 is what you've allocated as your gambling bankroll for the weekend (as opposed to all the money you have to your name).