might want to change the coolant and run a 50/50 mix, I beleive this gives the optimum temperature protection. Uses windshield washer fluid that is a de-icer and will not freeze in the cold. I also agree with the snow tire comment, all seasons are good but nothing will match a snow tire. Make sure you have a ice scrapper and snow brush.
Other then that I can't think of much. As 98SE said practice driving in a parking lot first. That semi controlled environment will help alot for learning skid control and traction limits of the car in the snow.
