You also can't sign a lease on behalf of someone else unless you're a broker. 

As well as signed up for some real estate courses to get my real estate license to lay down the foundation for real estate investing.

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As Grant Cardone would say, " I could get $200 standing on the corner with a sign that says Help."

I won't name the companies here, but I will caution anyone investing in turn-key to ask a few questions prior to selecting an operator: (1) are you a broker selling another company's turn-key?

It needs to be on paper and signed by both parties to be bindging

Or sign something that the new owner assumes?

As well as signed up for some real estate courses to get my real estate license to lay down the foundation for real estate investing.

Another question, if I sign a disclosure form with them, am I locked in with this broker?

Steps: Sign up for a class, complete the online application with DBPR, sign up for background screening, complete class (DBPR has to clear you before you can test), take state exam, join brokerage, broker submits your application to state to join their firm, license becomes active (you cannot sell real estate until your license shows active with a brokerage), and then join Board of Realtors for your area.