When you are learning to surf you should start on foam waves. It´s easier. You have to know how to walk before you start run. First you need to know how to stand up and ride the wave with a good and steady stance. After that you can start going on the green waves.
However things will be way different. Starting by the take off. If it was easy for you on the foam waves now will be more tricky. Now a lot of new things come to the table. Timming: when you should do the take off? Position: Which part of the waves should you stand up? Angle: How should i approach the wave?
This video by surfing with amigas can help you to understand the take off on a green wave.