Do you know the meaning of the word niche? I don't ask this sarcastically. In case you don't, niche means a specific, (usually small) space or position in which only a specific product/service will fit with everything else. For example, niche marketing is marketing to a very specific audience. So a magazine like the American Model Yachting Association, only interests people who build and race tiny model yachts. That is a niche. A tiny, very specific, audience. I mean how many people do you know who subscribe to a model yachting magazine? Lol hope this helped!
Niche marketing refers to marketing within a distinct in realization that the more you focus on that markets, the more you will be able to attract and target the really interested readers/ viewers/ buyers or just audience in general.
one of the easiest ways to deal with niche marketing is to go where the audience is. With that being said, pick up magazines. Another very effective means is to go to forums on that particular niche.