In olden times for winter preparation you would change the oil to a winter grade, flush the antifreeze and/or put in extra for the cold temperatures expected. (ask your grandpa). Today engine oil viscosity is multi grade through the magic of chemistry, which means it flows like winter grade when cold and thickens to full viscosity when warm. There is no longer any need to change oil for the winter, unless it is due by time or mileage of course.
Antifreeze in modern cars is also a long life formulation that in normal circumstances can last as long as 100,000 miles. The freezing prevention properties do not wear out so there is no need to worry about that either as long as you haven't had to add water over the course of the year due to leakage.
So what do you do for winter? I recommend that you make sure the window washer solution is a winter mix that will not freeze and check the date code on your battery. If your battery is five years old it is likely near the end of it's lifetime and may let you down some cold morning. (we can also do a quick capacity test if you are worried, just drop by anytime) A fresh cleaning and polishing of the paint might be beneficial in protecting the paint and also allowing the snow accumulations to slide right off. Locate your window scraper, boot hat gloves and if you travel out of town you might include an emergency package in the trunk with food blanket and water in case you get caught in a storm.