General questions about truck usage

Hello, I did the CE driver’s license in 1998 and would like to try as a professional driver. I have already searched various search engines and websites but found nothing meaningful. Now I would like to try it here. Here a few questions that came to mind: 1. Driving and rest periods Why, Why, Why is it clear to me but how do the penalties look if I don’t stick to them? 2. Total weight allowed I let myself say that I have 3% of the load Is that true? If so, what about penalties? 3. Top speeds BAB 80 Landstrasse 60 Innerorts 50 Wasn’t there even one thing where you were allowed to drive 70 inside when it was signposted? I would like to thank you in advance for Euro help. MfG dotterswelt 👿