you can definitely raise chickens for both eggs and chicks, you will need a rooster to fertilize the eggs. a good ratio for egg fertility is 1 rooster for every 10 hens. some people take it to even 12+ hens per rooster but i keep it at 10 to ensure fertility. if you have more then 10 hens it becomes harder for the rooster to mate all of them resulting in some unfertilized eggs. if you keep the ratio 1:10, you should not have a problem with eggs being not fertilized. second, it is very rare for hens under a year old (technically called pullets) to go broody. broody is when the hen wants to sit on eggs to hatch them. some breeds go broody alot more often then others, and some breeds dont got broody at all. choosing your breeds is something you will want to research deeply. i suggest just going with an incubator to hatch your eggs. you can get them for as little as $50. when selecting breeds, i suggest going with dual purpose breeds such as the buff orpington. they will go broody but also lay about 4-5 eggs per week and become a pretty nice size to butcher. hope this helped you. if you have any questions let me know.