you will see it repeated over and over on here - prepare for more than what you think you will want. I started with 3, i now have 8! Once you get hold of the little things you will want to add different breeds, maybe try hatching, your friends will want your eggs etc! It is just me and my wife, we dont eat that many eggs - maybe 3 per week each, we sell the others, not for profit, just enough to pay for the food, so dont worry about the eggs!
I am in a fairly urban area, i live on about .24 of an acre, i started with total free range but the chickens like to eat everything, so now they have their own picket fence run.
Good luck with the research, this website is a gold mine. I promise you will love keeping chickens, it is totally theraputic, i work for a bank, have a very stressful job, my chickens are my refuge along with my vegetables!