Welcome to the forum.
I don't want to discourage you, but I agree with the above posters: if you're keeping your betta in a bowl, you need to do a lot of research and upgrading before you will be ready to breed bettas. It takes some time and patience to become a good betta keeper, but it's pretty easy once you get the hang of it.
I see from your profile that you are not familiar with the aquarium
nitrogen cycle. This information is absolutely critical for every fishkeeper to understand, so I invite you to start by reading this, a few times if needed:
http://www.fishlore.com/NitrogenCycle.htm
I'd also like to reiterate the importance of the article Lucy linked to you, which is here:
Welcome and Betta Care Guide - Please Read First!!! . This article was written by one of our most experienced betta keepers and contains the collective wisdom of many knowledgeable FishLore members. It will give you all the basics that you absolutely must know if you want to keep a happy, healthy fish!
Betta splendens are, contrary to popular belief, not fish that can be kept in a bowl. They are tropical fish and need to live in a heated, filtered tank. Please consider getting a bigger home for your betta, and at the very least a heater. He will be much happier and healthier, and you will have far fewer problems with him if you do.
