Depending on your situation and what your doctor says:
You should be able to drive after 2 weeks of having surgery, usually 6 weeks after surgery for light/moderate exercise. I waited 4 months before vaccuming but that's only b/c the nurse practictioner at my ob office said I wasn't suppose to for 1 whole year! I personally could not go a whole year without vacuuming - I waited as long as I could. I've not had any problems (at least none that I know of).
With itchy skin: try keeping it moisturized (lotion) and drinking plenty of water. Part of the itching to is the feeling coming back into the nerves that were cut for the c-section. It'll get better soon! :)
Congratulations on the birth of your baby boy!
~A. C