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a) Usually, one rooster is all you need. Two will often fight--maybe not right away, but eventually, and birds can become injured. I know there are exceptions to this (especially if the birds were reared together), but I've raised chickens a long time, and this is good general advice. Not all roosters are mean (yes, some are quite mild) and not all will attack children, but roos generally will see unsupervised children as, well, a "manageable threat" so it's best to keep a close watch on the child when s/he's around the chickens.
b) Many, many people sell fertilized eggs. The only difference between a fertile and an infertile egg is that one can be placed in an incubator for 21 days and hatched. The other can't. That's about it. Otherwise, they look and taste the same. Most customers expect farm-fresh eggs to be fertile. Price-wise, with fertile eggs, you also have the option of selling them as "hatching eggs" and may get more money.
c) Most Roosters absolutely DO NOT encourage the hens to lay in the woods. Roos will usually encourage hens to lay in the nesting boxes you provide. Hens may "steal out" their nests, but that's the hen's decision, not the roo's. He'd rather she was around for easy access.
Having a rooster around provides you with more options. It also means you'll have to keep an eye on your child, but it should be manageable if you choose a good-tempered breed.
Here's a helpful chart that includes temperament per breed:
http://www.ithaca.edu/staff/jhenderson/chooks/chooks.html
Hope this helps.