I would assume in your first few hours you will learn to use a button lift (a rope u hold onto that drags you up the hill) stand up (not as easy as it sounds with a plank of wood attached to your feet),
stand up while on a slope without moving, this will involve digging in an edge of the board, probably your heel edge, basically this is done by raising your toes up. Once you have your balance and aren't moving you will lower the angle at which your board is dug into the snow, the closer it is to being flat with the snow the more you will move and the faster you will go. After sliding forward a couple of feet you will be asked to go back on your edge to practice stopping while in motion. Getting used to this will take a fair amount of practice and will involve a lot of time on your bum when you did in too much and fall backwards, or accidentally dig in with your toe and fall forwards
From here you could learn to do the same thing on your toe edge (with you facing back up the hill) or you could learn to turn
as people have said the best way and the simpliest way to turn is to look where you want to go you turn your head, your body follows your head, your board follows your body.
Once you have gotten the hang of your edges and basic turning you will probably find you prefer one of your edges, from here you can do what is called the falling leaf technique which as the name suggests involves going down the slope in a zig zag motion on the same edge.
This is good for you to start off with and work on your turns and balance, when you can do this well enough though you will want to push yourself and try and link your turns together (use both edges)
Thats pretty much snowboarding in a nutshell, after you can do this its just practice
