You'll have to wait until your ready to sell. Prices go up and down as feed prices go up and down. I would chekc craigslist for the going price in your area. I know frm fresh eggs dont sell for much here since alot of people already have chickens. But in more suburban areas they sell for more.
Check with your local municipality to make sure you don't have a bunch of bullsnot to go thru, like permits, and health department inspections and clearance. And make sure you don't have to pay taxes on what you sell. Some places you don't, and other places are just a pain in the butt.