Hi & welcome!
You'll get lots of help here in trying to breed fishies. Many here have/are successful breeders.
Personally I don't, nor do I want to, breed fish. Time, finances, and space are only a part of why I choose not to breed fish. It's is not something that I am interested in doing at all.
Anyway, good luck with your breeding of fishies. Post a pic of your tank sometime. Approximtely how many liters/gallons does your tank hold? You said it's a foot long, what are the other dimensions?
Take care & have fun,
Caper