I have been snowboarding for quite a while and I have some tricks for beginners.
Step 1: Equipment
A lot of beginners end up trying snowboarding for a year and then giving up. If you aren't so sure that you're going to stick with snowboarding don't buy expensive equipment.
These are some good brands for a beginner snowboarded:
Moment, Limited, Sims, Lamar, Luna, and Burton makes all kind of boards. My board is kinda big, but your bord should range from as tall as your shoulders to your nose.
USE A HELMET
Just use a helmet. Don't say that you don't need because your to cool because you do. If you aren't doing anything extreme you can use a skateboarding helmet.
Coats and pants
Get light stuff to wear or else you will sweat like crazy. You can actually get cheap Volcom stuff off of Amazon. Underneath your snow pant you can wear basketball shorts or pajama pants. NOT JEANS. For big slopes get goggles, but not for the bunny hills.
The bindings are very important. Try to avoid plastic straps on your bindings and get rubber instead because the plastic will break.
These are very important too. Your boots need to be stiff so you don't break or sprain your ankle. You should always check to make sure that you boots fit in your boots.