Thank you John; the negative came out right from the scanner. Better estimated exposure, I presume.
Keep on shooting, test different films, my system wasn´t right from the start.
Maybe you find that it is not a camera for you, or not for now, I had my Rollei more than a year before really falling in love with it!
Another story:
Today I came home from a buisness trip with five exposed rolls and two unexposed rolls. I managed to develop the unexposed rolls first! I had every exposed film clearly marked, but took them out of the boxes while talking with my wife and cut the ends round without looking clearly; another developing session tomorrow!