Most of what you need to know with regards to strength training can be found here:
Another option if you want a program that focusses on strength development but also has some time scheduled to build/maintain your conditioning:
http://70sbig.com/wp-content/uploads/files/Articles/Lascek_S&CP_v2.0.pdf (from http://www.70sbig.com)
Doing the SS workouts without supplemental conditioning would not necessarily be a bad thing. You are generally better off focussing on one goal at a time. If that goal is to be bigger and stronger, you are more likely to be successful if you avoid excessive conditioning work during your strength training period.
One caveat: These programs call for a 3X5 rep scheme. Sets of 5 can be very productive, but I would strongly recommend starting with 10 rep sets while you are learning the movements. The weight you would use for a 10 rep set will be lighter and you have more reps to really figure out the form. Also, the higher rep will help strengthen the connective tissue and help you to avoid injuries. After you get comfortable with the movements over the course of a few months, you can start adding weight and decreasing the reps to 5.
Take the time to really learn how to do the exercises in those programs properly or don't bother (but also don't get paralyzed by over analysis; get a good grasp of the basics and then learn by doing).
Same link as before: http://www.marksdailyapple.com/primal-blueprint-101/#axzz1q88dxnuz
Scroll down to "Is it Primal?" Eat food off of that list in large quantities, especially post workout. Ignore some of the low-carb bias on that site though - eat plenty of potatoes, sweet potatoes, and white rice, but avoid wheat, and avoid all processed crap-in-a-box. Eat REAL foods - chicken, beef, eggs cooked in butter,....
I don't want you to get fat and you won't. As long as you are eating clean foods and lifting heavy, your body will tend to partition nutrients into muscle synthesis. The problem is, building muscle/getting stronger is a very metabolically expensive process and requires a lot of energy. That's why you need to eat a LOT. I'm not going to lie though, it is possible that some fat might come along for the ride, but with all the new muscle to burn calories, it will come off very easily.
And again, don't neglect sleep. That is where the recovery/growth happens. Nothing will mess this up faster than not getting enough sleep (it will encourage fat gain and prevent you from progressing the way you should).
Full Disclosure: A few years ago, I was 6', 156lbs. Doing the above, I put on 30lbs of muscle and very little fat (still have teh visible abz - LOL), and I'm much older than you (downward slope on the testosterone curve). You are still a bit younger than is optimal from a hormonal perspective for growth and recovery (you will have much more testosterone in your late teens/early twenties), but learning this stuff now will give you a great head start - especially if you want to be an athlete. I wish I had this info when I was 15!
Ultimately, your goal should not be to match the weights of HS skiers. The weights of some world cup racers around your height:
Ivica Kostelic: 5'11", 207lbs
Ted Ligety: 5'11", 179lbs
Benjamin Raich: 6', 183lbs