gold fish are aquarium fish! do you think they only need a bowl?
Because they need a good sized tank (50L +) and proper filtration, by filtration i mean a filter with filter pads and media to house bacteria.
they preffer moderatly hard water (10-15 GH) with a slightly alkaline PH (7-7.5)
i hope you understand goldfish and dont think that they are easy, just because there cheep doesn't make them easy fish. they are one of the hardest fish to look after.
im assuming most of this from your word order, but its always a good thing to get extra information on the fish you have.
im sorry i don't know how to breed goldfish but im sure someone will post with the answer