Military models are generally Tamiya, Dragon, Hasegawa, Trumpeter and Bullwinkle brands. In principle, these brands have no agent fee, but now the market has been monopolized, want to own agent is difficult, generally are two or even three agents.
Opening a model store is mainly rent and goods, the most important thing is to press the goods, the more goods the whole business is about good, generally press the goods at least three or four million dollars.
First think clearly whether you want to focus on static model or dynamic model, and then more into a few brands of goods (especially the classic models), after that you can start.
To do a good job, you need to play well yourself, so the signs are more attractive. And remember to get on peripherals and tools, sometimes scenery, props and tools make more money than models.
I hope to help you, there are still questions, just follow up with me.