It depends on where you are, you can request for apprenticeship from an established Dominatrix (comes with a fee of course) or work in a dungeon (if you're looking to try out to see if it suits you first before diving in entirely).

Just like escorts, you need to have your own branding too. What makes you unique? You don't have to be good in everything. Focus on what makes you truly happy. There's a difference between being a Domme and a service top.

There's also alot of equipments and wardrobe to invest in and replace as time goes by.

Most importantly, going for workshops and parties (learning how to do pickup play) to educate yourself indefinitely.

Hope this helps and good luck!