Hi there. I have a textbook out on Amazon. If you have kindle you can download it for free its called "LASER AND INTENSE PULSED LIGHT FOR AESTHETIC PURPOSES: CORE OF KNOWLEDGE" Might be worth a read as it's free to see if it's really for you. As for training go the easiest route is to do your Core of Knowledge online. I did mines with Intermed-clinical.co.uk it's about Ā£150. Then do a practical course with someone and that should be you apart from checking with licensing requirements with your local authority. You don't need to register with the CQC as you're not offering it as a medical treatment. Build as you go. Or the other route is to go the whole hog with a school which will cost you a few thousand quid to do, and I feel are usually very rushed!!!
Hope this helps
Nicky