Personally from experience the hard work is in the research of finding a micro niche, once you have that nailed down then you quickly understand what topics are likely to be winners and which are to be duds. An understanding of SEO is critical though.
In terms of someone setting up, the barrier to entry may seem minimal but theres nothing like getting out there and giving it a go;
Google Product Search + Market Samurai + Hosting&Domain + X Site Pro + Adwords Account + SEO = Done.
Personally from experience the hard work is in the research of finding a micro niche, once you have that nailed down then you quickly understand what topics are likely to be winners and which are to be duds. An understanding of SEO is critical though.
In terms of someone setting up, the barrier to entry may seem minimal but theres nothing like getting out there and giving it a go;
Google Product Search + Market Samurai + Hosting&Domain + X Site Pro + Adwords Account + SEO = Done.