It takes 21 days from the start of incubation for an egg to hatch. Most people buy their chickens as sexed chicks from hatcheries. There might not be much of a market in your area for unsexed, mixed breed chicks.
Technically, you don't need a rooster at all. Hens will lay eggs whether a male is present or not. The only reason you would need to have a rooster is if you want fertile eggs for hatching.
At the top of the reply box, there is a tool bar. The icon that allows you to upload and attach a photo is the one that looks like a postcard with mountains.