There is a lot of stuff out on the internet giving advice on how to be a pro. Some good, some bad. This little article really hits home. I would give it five stars out of five stars. http://www.creativeboom.com/tips/what-i-wish-id-known-9-golden-tips-from-some-of-the-worlds-best-photographers/
Published on February 7, 2017
CLG Photography Blog 
Actually, this article could almost apply to any profession and professional relationships. Remember the old saying that went something like this “if you’re passionate about your work- you’ll never work a day in your life!”. Being prepared, drive, all of it is very relevant.