I'm not sure if you are going into Wilderness land or not. If not, are you going to take ATV's? If yes, are you taking horses or mules in? Its something that could make life a lot easier as to what you are taking in. When I go, we usually take horses.

Depending on where you are going, cell phones, may not work. You may want to consider renting a Satelite Phone.

Be sure to take a first aid kit, a mirror, some flint (and know how to use it), water proof matches, some real good worn in boots (especially important with your bad ankle) and a GPS. You may also want to bring a walking stick.

I'd also try to get into good physical shape. However, remember that the altitude (breathing) is what will take someone out before your muscles wear out. I don't know any real way to train for altitude safely.