I have lotsa learnin' to do!

With just hens, life is simple. If I start hatching, then I'll need to learn how to tell fertile eggs from infertile, how to safely integrate new birds into my flock, and how to handle too many roos. --all new to me.
That also means I'll need to setup a couple new enclosures (I assume). One for young chickens too small to go with the main flock. Would extra roos be kept separate (from main flock and/or from each other??) until they're big enough to process? (cavemanrich, we are fine with sending them to freezer camp)