I have goldfish and they are great but the biggest myth that needs to be addressed it that they do fine in a "fish bowl" Gold fish actually need good sized tanks to thrive, great filtration, cooler temps and small frequent feedings. To breed they need a cooling off period, followed by frequent water changes and a gradual warming of water temp. Spawning mops (I make mine of large corks with thick yarn hanging from them) need to be placed in the tank. Then it is quite easy to move the spawn into a hatching tank, filled with water from the main tank. A sponge filter for the hatching tank and you are good to go. Remember to keep water quality high and cull...moving the babies into bigger, tanks as you go. If that is too much trouble, have fine floating plants, plastic or material, in the tank with the parents. They will eat what the can and some will survive by hiding in the plants. Good luck.
Drs F & S sell goldfish but I find their prices a little high. I love the Panda Orandas. White with black edging...just beautiful.