It is amazing how much gear you need to ski. I ditto the remark about wearing less under your jacket. About the only time you feel cold is when you are on the lift. Don't know where you are planning on skiing so don't know how cold it will be. That would help determine what base layers you would want to wear under your ski gear. I always opted for synthetic over wool and depending on the temps you could go, lightweight, medium, or heavy.
For ski pants and jacket - I go for Gortex material (I always preferred thinner and not bulky, easier to move around. You definitely want windproof and again depending on where you are going, waterproof. You want a jacket that will zip around your neck, with a hood.
As for socks, I always wore 2 pair - silk and then a woolen over it. Since you will probably be renting, may I recommend a thicker wool sock. You want that ski boot to fit snuggly around your foot.
Like Runcarla said, as a beginner you will be working hard. They will teach you how to walk up the hill in skis, how to fall, and how to get up. You will definitely get a workout! Hope you have fun!