If you are not sure of your level of skiing/snowboarding ability...follow mountain signs to keep you on the right trail. There will be far more skilled snowriders that will speed past you, so stick to your mountain level.
Also, keep off the areas that are blocked off, chances are, they might be prone to avalanches or huge dips/cliffs.
If you visit the Stubai Glacier but have limited experience, get lessons.
I had done well on beginner slopes in the past but it didn´t help one bit on the glacier. I survived without broken bones but it was more luck than anything else.
Skiing is great. There's almost nothing as thrilling as gliding down a mountain.
Skiing however is no natural way of moving for people, it has to be learned. Don't think you'll learn it by yourself. You'll have much more fun if you do it right, and it's great fun to be in a class with others who are as helpless as you are!
Last but not least you are a danger to others if you can't control your speed or direction. Many accidents are caused by beginners who didn't take lessons.