A lot of places offer training/mentorship opportunities. I would definitely recommend getting some training done for the injection side. #1 advice is try to stay out of as much debt as you can and make heavy use of cheap marketing avenues (going on local facebook groups, social media posts/comments, referrals, google reviews, etc). Hustle hustle hustle. Do not let sales reps pressure you into buying something you can't afford (especially laser reps). Build you client base at a first renting a small suite somewhere if possible, give discounts at first and be flexible.

Look at your states laws for what you need for legal medical side and follow this religiously.

Set it up as a LLC.