If for some reason someone decides to cut you a check, taking it to the local check-cashing place is really unprofessional. I know lots of people don't trust banks . . . Open an account so that you can cash and write checks. You can't pay by money order for the rest of your life. Next, apply for a small business license or incorporate.
Every state has pre-requisites for doing it.
It's up to you to find out how and get it done. This will enable you to get a tax ID number. You would be amazed at the joys a tax ID number can bring. It's a beautiful thing. Take advantage of it.