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Great book out there: Raising Chickens for Dummies. Not implying you're a dummy, but you're totally new to this. The book will help you a lot.
All an egg needs to be fertile is a rooster and a hen getting together. Your hen will lay eggs without a rooster, the eggs are only fertile if the roo is active with the hens. Fertile eggs taste just like non-fertile eggs. You will not be eating baby chicks if you eat fertile eggs. For a chick to begin to develop, the hen must incubate the fertile egg. THis whole process takes 21 days. The eggs can sit around for weeks before the hen starts to incubate. Until then, there is no baby chick there, just the potential.
You say you have a lot of predators around. If that's so, you probably can't free range your chickens with any success. You will have to build an enclosed run to go with your coop. A rooster can help you with predators, but your roo will give his life for his girls, as many on BYC have had to witness. If you have a lot of predators, fence your chickens.
You don't say how old your kids are. If they're really young, I'd advise no rooster. Roos are great, beautiful, full of personality, soundh the alarm when danger is nearby, keep down sqquabbling between the hens, and are generally wonderful to have around. YOu have to raise a rooster right though, otherwise he will always challenge your authority (some just will no matter what you do) . This can be quite dangerous when his spurs grow long and sharp. You don't want a child disfigured because you have a nasty roo. If you do have a nasty roo, I agree with another poster--invite him to dinner. He can be the guest of honor.
Get the book, read, read, read. Come here, ask lots of questions and read, read, read!
Good luck!