You're going to need a lot more then that.. breeding bettas is expensive and not easy.
You will need to condition them for a few weeks, while preparing the fry food, many jars, heaters, etc..
Here is just some of what to expect/get/consider.
Considerations & supplies
Conditioning and spawning
And lastly but not least:
Raising the fry
It's not an easy, nor cheap task to undertake. As well as there are a lot of things to consider such as genetics.. a lot of inbreeding and bad genes sadly come out of store bought bettas, so take that into consideration before you bring hundreds of little fry into the world, and prepare to cull them down if you have to.
I would suggest doing A LOT of research before you try to breed them.. it's not something one should do on a whim. And before you try, try to find a home for a hundred+ babies (not to mention all the jars for the males before they are able to be given out). =)