Thank you @guchtere!! Oh I don't want the smaller board yet, haha :-) I'd rather prefer to feel more secure on the bigger one. But I know: that's how we come further...

There is no fixed schedule since it all depends on my level of progress, and so far we've changed something in all of the training sessions. I started with a 3.0 sail and now I'm with a 4.0 for instance. Two lessons ago I began to try the harness. My instructor is a PRO who competed in the PWA tour until a couple of years ago, so I totally rely on his knowledge :-)