Simple question about CJ site traffic
 

I'm thinking of trying a CJ site. I know everybody hates them, but WTF. How much traffic would I need to start one, how long would I have to keep buying traffic, and how much would I be expected to pay for this traffic? I have traffic already, but it's SE traffic and I don't want to push any of it to a CJ site. Also, does anyone know an honest traffic broker to purchase this traffic from?
I know these are newbie questions and may annoy some you, but you've gotta start a project somewhere.......