make sure you dont have anything planned the next day. I have been snowboarding for about 7 years now and I love it. But I still remember my first time, it was a bit harsh at times and quite painful the next day. I was also at a shitty resort with mostly fake snow and icy conditions at night time. It is much better if you can go early in the morning with fresh snow.
As far as a basic tip goes, its easy to stand up and go down the hill anyone could do it. The skill comes in learning control in your movement and stopping. Your gonna have to be willing to fall and go down to learn to stop and turn, but you gotta just go for it. A lof people will just go straight for a while and then sort of force them selves to fall and try to almost sit down instead of just actually trying to stop.
Ok, had a couple of lessons indoor, and while the beginning was like expected -lots of snowbiting and butt-brusing- I was amused.
My toe-side turn needs alot of work, but I'm getting a hang on it. Bound for many more crashes on the real mountains with camera's rolling so keep an eye out for me on youtube!