Do I need a Trademarked brand or Brand Registry for this?

I’m listing my product and in the general information it asks for Product Brand: _______. There you can put generic or your brand. I put the Brand name that I want to use that I will eventually Trademark and get Brand Registry for, but I was thinking I’d do that later on. It asks you to upload pictures with your Brand name on the product or packaging or whatever as proof that you own that Brand I guess. Am I okay to tell my supplier to print the Brand name that I plan on using on the packaging and that’s it or is Amazon going to have any problems with that?? Thanks in advance for the help!!