"如何做好品牌代理商"用英文咋说?

商品代理商一般用dealer比较多
agent一般属于服务用

car dealer/pc dealer

property agent/ government agent

How to be a satisfactory brand agent?

How to get done with a brand agent?

How to be a good distributor/dealer?

In English, people won't describe 品牌。
How to be a good brand dealer sounds weird.
good brand + dealer (好品牌的代理) or
good + brand dealer（好的品牌代理）??

how to become a good agent?

How completes the brand business agent