It would behoove you to take some time to sift through this section of the forums. There are a great deal of excellent threads that explain everything from insulated jackets to waterproofing to layering. Then go through the boots section and do the same.
I'll tell you this much, you need snow specific outerwear or you'll be wet, cold, and sorry. You also need snowboard specific boots. You can strap in with regular old boots, but you're going to break your ankles real quick.