It's pretty much like making couscous or rice. Boil 2 cups of water with one cup of quinoa (or any 2:1 ratio), turn down to simmer for about 10-15 minutes. fluff up with a fork.
While it's simmering, you could throw in some fruit or nuts, raisins etc to make a nice hot breakfast cereal or make it into a savoury pilaf by thowing in a bit of chopped onion, green orred pepper, carrot and herbs