To breed fighting fish the there is a long and painful and sometimes expensive journey.
You ahve to first "condition" the fish to get them ready for breeding this means that you feed them food that have a high protein and nutrition value. Also live foods are the best when conditioning them. After the male AND the female have been conditioned you have to know when to add the female at the right time a tank of 20 gal
will be much better because then you can make a lot of hiding spots where the female can hide before and after breeding. The male will also make a bubble nest where the eggs will be stored one hatched i segguest feeding them baby brine shrimp no older than a day. Once they start growing then you will need many glass jars or small tanks. Because they will start fightiing eachother when their fins start devolping. At that point they will live in the jars or small tanks but the females can stay together. then what you do with them is your decision
Hope this helps