MNS and CJ questions

I just want to start a MNS with CJ make some money, but I confused with Micro Niche should HOW MICRO IT IS ?

For example, I want to sell kitchen ware which is not a micro niche. should I focus on such as bakeware ?

Then should I grab the domain with bakeware ?
and the site should ONLY sell bakeware ?
OR major sell bakeware with some other kitchen ware ?

Please advice and thanks very much