What type of business is best for me to start?

Question Details: I am a licensed clinical professional counselor in IL. This is the highest license in the state meaning that I do not need supervision in my private practice. With having this private practice would I need to apply for a business LLC, INC, etc. or could I just trademark the private practice name and work under that? I want to be able to write things off on my taxes for my business but I'm not sure if you can have a business tax ID without having an actual business.

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