Could I offer a different type of advice? Go and get some simple business and marketing books and read them.
Becoming a nail tech means you are starting a business, and it's important if you want to succeed that you have a basic grounding in marketing, accounts, selling, customer service and business law - as a business owner there are laws you must follow and understand. This is not as complicated as it might sound - there is a lot of free info from business centers too - they even offer free advice. from experienced (often retired) business people.
In an ideal world, nail techs would be taught this in their courses! When I become prime minister I will fix that!! :lol:
It's not enough to make great nails - you also have to be a business professional to make money and succeed.
Good luck and enjoy the training!
Bob