I suggest you start with one of these ones :
This one explains how your strength training can be done more efficiently :
Leg strength and ski balance
This one gives you some more general guidelines if you want see how you can fit your training in :
The When and Where of your ski fitness program
This one gives 6 simple to designing your own skifitness routines :
If you don’t care to read about all of this and just want to get started on a plan to get fit for skiing – the most direct way, I have made these SKI EXERCISE PROGRAMS that will help you get fit for skiing in as little as 2 x 30 minutes a week.
Training for pain prevention
Finally, if you are mainly concerned with preventing certain pains you have when you are skiing or you are returning to skiing after an injury, click here.