Two questions first: what color eggs sells best in your area? White or brown? Leghorns lay white eggs; RIR's and sex links lay brown or tinted eggs. All of these types of chickens lay quite well (you'll want 'Production Reds' rather than show-stock RIR's if you go with them).
And do you want a self-contained breeding flock, or do you intend to replace your hens from a hatchery every year or two? If you want a self-contained breeding flock, you should get purebreds, as the sex-links won't breed true.
For space, you should figure about four square feet per hen in your coop, and about ten square feet per bird in the outdoor run. These are minimums -- more space is better if you can manage it.
Kathleen
ETA: if the object is to have some income from the flock, you really ought to get good quality purebreds, and breed to standard, so you can sell hatching eggs and chicks. They sell for more than a dozen eating eggs will.
