There are 5 major misconceptions about gear that most people don't know about. So we'll fill you in.
WEAR THE RIGHT SIZE BOOT
Most people don't wear the right size boot. If you are a size 10 sneaker, you should probably consider a size 9.5 or even a 9 as a snowboard boot size. The most important part of your equipment is the right size boot. Eliminating all heel movement is key to getting quick response from your board. When you put your boots on, tie them tight and lean up on your toes. Whatever movement you have in your heel is how much you will need to raise your heel every time you go to make a heel side turn.
WEAR THE RIGHT SOCK
Cotton is your enemy. You need to find a sock that is polyester or nylon or some mix of both. Every shop around you will have a plethora of socks. If you are trying to wear the right size boot, thinner is better. Socks are not really made for insulation purposes. They are made to wick away moisture.
WEAR THE RIGHT HELMET
The cool thing right now is to wear your head gear in this order: hat, goggles, helmet. This is not the safest way to go. If you are looking to protect your head, which I assume is the reason you bought a helmet, then you don't want to wear a hat underneath your helmet. If you can fit a hat underneath your helmet, then the helmet is too big. If the helmet is too big, your brain will rattle in the helmet if you crash and will cause you to be concussed. The only hat you should wear under a helmet is a thin nylon skull cap.
GET THE RIGHT HELMET / GOGGLE COMBINATION
Make sure you bring your goggles when you buy a helmet or vice versa. You're looking to see if there is a gap between your goggle and helmet. If there is, you may either want to consider a different one thing or another or getting the thin nylon skull cap to cover that gap. You get brain freeze like never before with a serious gap.
DRY YOUR BOOTS OUT AFTER EVERY USE
Pull the liner out of the outer shell. Don't worry, you wont break anything. Less moisture, less friction. Your feet will thank you.