Brand Registry tips?

I have a unique item / brand that nobody else has. Basically, they are novelty bills and cards with a message on the back. I’ve been selling them profitably on Amazon for nearly two years. However, the listings are all shown as “generic” since I don’t have a brand specified. Would using the Brand Registry allow me to show “Gospel Tract Planet” as the brand (the name of my company) for my items?

Another question: Brand Registry would prevent others from selling my items. If I’m actually the one producing them, is this a concern I should have? Are there ways I’m not thinking of that others would be able to steal my brand identity?

Thanks for your help!