Kev,since you are new to goldfish i envise you
to stay away from breeding,i've been learning about goldfish
and about breeding them for at least 2 years i still
can't breed them.
Your goldfish have to be at least 3 years old,You need to know
how to tell if they are a male or female,you need to know lots before
breading them.
Im not saying you can't, but i find it would be alot better if you
learn about the types of goldfish fisrst ,the common rules for goldfish.
Before you try to breed them.
Im just starting to learn about breeding.
Something else you should start learning about is compatible fish for godlfish.
Because going and learning about breeding is a big leap for you.since you are new to goldfish not only that you have to learn about that..
you need to know about the frys.

Hope this helps bye!