Start by looking at the industry from the top down. Look at how much money is spent in the industry and assess what the operating costs and revenue are for the major players in the market. Then, compare the market where you live to the international market. Next, take a look at the industry from the bottom up, meaning you're looking at how many customers and subscribers are out there. Look at things from the buyer's perspective. This will give you a a good sense for where the market is at.