Great news. With our 1st spawn (which we did in March this year), we put in an anubias on driftwood, some floating plant (name escapes me atm) & they lived off the microorganisms off the plants & we gave yolk plus BBS.
Remember to keep it clean & try to disturb them as little as possible.
Best of luck.
Betta babies do not need to be fed at all for the first 3 days after they hatch. On the 4th day you can add tiny bits of egg yolk mixed with water several times a day. use a turkey baster to remove uneaten food after 20 minutes or so. look around outside for containers of green algae filled water. you can add that water to the fry tank a few times a day. be on the lookout for mosquito rafts that you can add to the fry tank. You may want to set a container out filled with water to start growing mosquito larvae. Don't panic. You can find food for them. You are just going to have to do a lot of work.