I don’t know much about wood floors, but I do natural stone restoration for long time. My advice to you is to start with taking some stone restoration courses. Trust me it is the most difficult trade out there. Marble is polished by friction and abrasion so you need to use diamond pads, polishing powders, heavy duty weighted machines and the list goes on and on, but the most important is to get some education in this area first, or you will pay big bucks to buy your customers new floors. If you need help with stone restoration schools or anything else, let me know and I will help you.