Thx very much for the detailed explanation. The reason why I take the intro-course is that I wanna take the extended course (which I guess is very much based on the intro course). Therefore I thought it might be a good idea to take it and just to view it.
Since the forum there is closed I placed now all of my questions to you directly and I really appreciate your supportive responses, especially cause they are detailed.
I think I leave here for the very moment (although some questions remain). But I think I'll try to retest and re-inspect things you mentioned, work little bit more and than lets see. Thx very much.