There is *no* one answer to that or everyone would be doing it and the income would drop thru the floor. Like theman said... it's alot of work, not easy, very labor intensive and not something that most people are up to. You just don't toss a few galleries up and make money or we'd be tossing gates out of his house.
Best suggestion? Build mainstream sites for your local businesses and make 100-500 a day fairly easy. That takes work too but is alot easier than trying to break in to adult during it's off season.
