Deductions & credits

Ok ... no matter what the goal is ... for 2020 you were either an employee or a contractor. If you are an employee you cannot deduct anything.  

 

So these commission checks ... did they have taxes withheld or not ?   If they did you should get a W-2 and you are an employee.  I suggest asking the shop owner and stop the guessing.  Until you know how they are treating you tax wise you cannot complete a return.