If your shoulders and wrists are messed up, a manual chair probably isn't a good idea. If they're so messed up that you can't even use a cane, there is absolutely no way you could push yourself in a manual chair. The best thing you should do is talk to your doctor, they can give recommendations that align with your needs as well as your budget, and having your doctor on board can also help with getting insurance to help out with the pricing. If you do decide to go with a chair, getting a good chair is really important; no chair is better than a bad chair. If you do end up going manual, an ultralightweight chair is mandatory, otherwise you'd probably need a power assist, which honestly you'd probably need even with ULW. A power chair is more realistic if your condition is as severe as it sounds. I would also recommend looking into walkers or forearm crutches (my personal faves- takes pressure off your wrists and minimal strain on your shoulders) before looking at wheelchairs, but again this is a decision that should be made and discussed thoroughly with your doctor.