Breeding Discus can be a bit of a hassle. It is known to be one of the most difficult fish to breed, but I do not agree. Frankly, I think with good food, water, and care, they will do just fine and make some babies for you.
First of all, Discus can begin reproducing at about 1 year of age. If you see any courting routines between two fish, watch them closer to make sure it is not agression. If you are sure that they are courting, then you have a couple! Now, this is not a sure sign that they will make you some little Discus. Sometimes you will get a pair of females, this will not happen in males.
Discus lay eggs later in the evening, if you ever get to see it happen, be sure and watch it, it's very fascinating. The females will make a few practice runs and then tshe will go ahead and lay the eggs. The male will follow behind her and fertilize the eggs. They will lay the eggs on plants, the side of the aquarium, rocks, driftwood, etc, almost anything. The parents may try to eat the eggs, and if they do, put a cover over the eggs, until they become free swimming. The eggs will develop into wrigglers in about 3 days. From there, they will break away from the place where the eggs are and go directly to the parents. They eat off of a slime coating on the parents' skin. They will do this for a few weeks until they become independent. At this point you can move the babies into a grow out tank. Here you feed them live brine shrimp and artemia, beefheart, bloodworms, and flakes if they accept them. Until they grow to about 2 inches, keep them in the grow out tank. Then after that you can move them into a show tank.
If you have good stock, and make sure not to stunt them, you may be able to sell some of them and make a profit. If you are intersted in the topic, you could breed those fish and start a small buisiness.
Laying of Eggs
Guarding and Cleaning of Eggs
Discus Babies beginning to show shape
From here all these guys will want to do is eat, and feed them at least 4 times a day, so they will grow up to be nice robust, colorful fish