I would disregard most advice about the quantity breeding tanks you set up. You need to first identify what you're able to handle and on what scale. It will relate directly to how much time you can devote to the specifics of breeding. Breeding for the sake of breeding results in poor stock. Breeding to strengthen stock and colors requires a great amount of time and tanks as you need to identify and cull the stock based upon factors such as color, size, fin development, etc. 90% of the people that say they breed do nothing more than allow proliferation of their stock and call it breeding. The people that are known for great stock usually devote a great deal of time and tanks for each species to achieve this goal.
Things you need to do are to separate based on sex, based on color, based on fin development, based on size, etc. There are many articles on the internet to help make you a successful breeder and explains how to separate and identify candidates for retention. They usually have comments to explain why you separate. One reason to separate by sex is to prevent early pairing. Some side effects of early pairings can include smaller fish, smaller broods, less healthy off-spring, poorly developed fins or bodies and undesired characteristics.
The IFGA has some very good tips about breeding and although it is meant for Guppy Fanciers, the same logic and principles applies to most fish. Pick the fish you want to breed and then research very carefully about breeding a successful stock, before trying you hand at it. There is no point of being in a hurry because it requires a lot of time, research and patience.
Good luck