There are many ways in which people select what market they wish to tread. One of the ways is generally from things that they are familiar with. Another way is to select something that you feel is in demand. Both ways can and may not work for you. There is a lot that goes into finding a niche market but I will do an overview that would help you find that illusive niche.
First of all, you must figure out what the niche is. Let us talk golf for example.