how and where to get "hops" for fermenting bread?

Answer 1

You need yeast to make bread, you can get yeast in any supermarket. Hop sare used to add bitterness to beer. You can get hops at home beermaking shops

Answer 2

You don't use hops for making bread nor fermenting bread.

Answer 3

Hops are boiled to make beer taste bitter, and impart some flavors and aroma. They are also used to preserve the beer.

It sounds like you are looking for yeast. You can usually find it at supermarkets, in the baking aisle. There will be directions on the package.