I’d stick with EJ’s advice. It’s not at all that difficult to make stock, and it freezes like a breeze. But it does take time, and I tend to do it on a Sunday, when I’m planning to spend the entire day at home. A few tips to add:
For your meat, if your butcher sells chicken backs or necks, use them. They’re cheap as hell, a bit meaty, and will flavor your stock perfectly. Otherwise, you can use any part of the chicken that has meat and bones. A good rule of thumb is about 2-3 pounds to each gallon of water. Heck, you can use almost any type of meat.
The secret of making a good stock is to cook it slowly. Bring your collection of bones, meat, water and vegetables to a boil and then turn your heat down to low. The stock should be simmering, not boiling. A flame tamer is helpful to distribute and diminish the heat. I cook stock for up to eight hours. You can cheat and get it done in three or four, but it won’t be anywhere near as flavorful.
A traditional addition to flavor stocks is the bouquet garni. Take three sprigs of parsley, one sprig of thyme and one or two bay leaves. You can tie it in string or (as I do) tie it with the parsley. It is removed later on.
Parsnip is also very good in broths. With the onion, you don’t even have to peel it. In fact, if you leave the skin on, it gives the broth a nice golden color. Another traditional thing to do with the onion in broth-making is to cut it in half and stick it with two or three cloves.
I personally go much easier on the carrots than EJ, because they make the stock a little two sweet for my tastes. Then again, the carrots 'round these here parts are huge.
Throw in some peppercorns, too.
Always, always, always add the salt at the end of your stock-making session. If you correct for salt too early, your finished stock will be too salty, as the water will have evaporated and concentrated the salt.
If for some reason your stock isn’t quite strong enough, you can cheat a little bit. Add a little bit of a bouillion cube and it’ll perk up the flavor.
Leek is also a good vegetable to use when making stock.