Where can I find the legal provisions for trucks up to 7.5t???

Search for the best regulations for a truck up to 7.5 t (provided by a car rental company) which I can still drive with the old pink driver’s license. I am supposed to support a promotion tour for a few weeks (Mo. – Sat.). What do I have to consider? What about driving times (not working hours!!), tachographs, breaks and obligations?