Congratulations! Everyone here is big on pictures, so once you get her home and settled in you should definitely whip out the camera. My suggestions are all based on how I
cat to the household. There are probably different and possibly better ways of doing things, but this worked for me:
Access to the entire house can be overwhelming for a stressed cat, so go ahead and keep the door to "her" room shut until she seems like she wants to explore--she'll let you know when she is ready. Keep the food and litter box in "her" room at first (just make sure that they are on opposite sides of the room as cats don't like to eat and poop in the same area).
Once she is ready to explore start leaving the door to her room open when you're home, and let her emerge as she wishes. I wouldn't start relocating her food and litter until she seems at ease in the house and shows no desire to seek refuge in her room. At that point you can probably move the food and simply show her the new location. As far as the litter box goes, you might consider doing a slow switch; what we did is move the box just a few feet every couple of days until it was in the desired location.
As far as showing your cat the litter box, I wouldn't bother. If it's in a small room with her she will find it on her own, and forcibly placing her in or near it could be frightening. Most cats will seek and use the litter box instinctively--if you find she has problems with it just let the forum know and I guarantee you'll get plenty of suggestions
A lot of people advocate the raw food diet for cats. Personally, I feed mine Wellness Core and they really love it. Basically you want to look for a food that is grain-free (preferably), with real meat (not meat byproduct) as the first ingredient, and no fish (fish oil
is fine). The general consensus now seems to be that canned food is better than kibble (for a number of reasons), so it's important to at least supplement your cats diet with some wet food every day if possible. Most commercial pet foods are very low quality, but the high end stuff can get expensive.
Apparently I'm quite long-winded. I think that about covers it though. Can't wait to hear how she settles in