I sell fire fighting equipment. I know nothing about fire fighting equipment. How to talk business? Does this industry make money?

First of all, we must understand the types, names, models, functions and prices of fire-fighting equipment and memorize them! You'll get familiar with it after a long time. You can't do business with others without relevant knowledge. About the profit of this industry: prices vary from place to place. If your purchase price is low, your local market will sell at a higher price, and the profit will be more objective. And how to negotiate with others yourself. I don't know if the answer will help you!