You won't know her behavior or personality until she's been with you a while. Cats really do sleep most of the time we're not home. Don't let yourself be pressured into getting a second cat unless you
want another one.
And I've always tried to adopt on a Friday so I can spend the whole weekend with the new cat. She might be shy and keep to herself for a day or two, that's normal.
Cats like being up high, is there a window sill or something else she can sit on and watch the outside? If not, maybe you could get something and put it near a window.
I have two scratchers in every room. I buy the vertical ones, but then I take them out of the incline and put them flat on the floor (my girls like them better that way, they even fall asleep on them).
I also have two of these:
Also, keeping her nails trimmed will help both of you (They won't get stuck in things, like furniture, carpets, you). If you can't trim them yourself (and some cats are just too difficult), your vet's office will probably do it for a small charge.
For toys, my cats have always preferred the boxes they come in. If you put out a box or two, a paper bag (with no handle), the cardboard roll from toilet paper, etc., then watch to see how
she plays, it will help you decide on toys to actually spend money on.
There's a product called Bitter Apple you can spray on cords and wires (works on most cats, but not all). Places like Home Depot also carry products that wrap around wires and cords.
To catproof your house, you should get on all fours or even lie down to see your place from her perspective. Since cats don't have shoulder blades, they can pretty much get into any space their heads will fit through (or so I've been told). My girls have gotten into places I would have bet serious money they couldn't fit into.
Here's a great site for preparing for a new cat: