No matter what tires you get, unless they are run-flats make sure you get a good patch kit, and a small 12-volt DC powered air compressor, along with an air gauge. While you're at it, make sure you have a flashlight or headlamp, as the one time you don't is the one time you will have a flat in the dark.
Next, check the condition and air pressure of your spare, as it sucks to have a flat, but it sucks way more to have one and only then find out that your spare is also flat.
Keep in mind that tire pressure decreases in lower temperatures. The same for elevation. A good way to remember is lower = lower. Lower temps, lower pressure, lower altitudes, lower pressure.
Make sure you check the lug nuts with your wrench, as many shops put on new tires with air guns set too high, making it impossible to remove them without a better lug wrench and/or cheater bar. This is also when you will find out if you have locking lug nuts; if you do, make sure you keep the "key" for them, and don't let a tire shop forget to give it back to you!
Also make sure you know where your jack is, where it goes, and try it out.
You want to make sure you are ready and able to change a tire BEFORE you have to!