Welcome to BYC!
You did indeed picked the right section to post this question.
You can learn to ID whether eggs are fertile when breaking them for cooking by looking at the yolks.
Check out this thread for some examples:http://www.backyardchickens.com/t/16008/how-to-tell-a-fertile-vs-infertile-egg-pictures
If you are going to raise replacement layer and meat chickens, think long and hard before building your coop(s).
A separate area in the main coop for a broody to hatch chicks and/or to grow out incubated chicks is well worth having.
Best coop planning decision I made was to be able to split my coop with a temporary chicken wire wall, there are 2 people doors, 2 pop doors and a separate run.
Meat birds you might want to raise in a separate coop or tractor, especially if you are going to raise the CornishX.
They have different feed requirements and because they will only be around for 8 weeks or so, no sense in disturbing the balance in the layer coop.
Browsing the meat bird forum will give you info about raising and harvesting meat birds:
If you're totally new to chickens, it might be advisable to start with a laying flock only.
Get your coop/run working well, the first year can be a very steep learning curve.
Male birds can be a pain (figuratively and literally), especially if you have little kids running around.
Then add a cockbird and an incubator for raising replacement layers.
Then think about a tractor and butchering equipment for doing meat birds.
Unless you like being overwhelmed and learning about chicken care/housing, dealing with male livestock, incubation and/or broody hens, and butchering all at once.