Hi, welcome to the forums, I'm kinda new at this myself and just had my first batches of fry also. They are guppy fry and I'm feeding a mixture of liquifry , hikari first bites, hikari frozen baby brine shrimp, and this other powdered fry food called baby bites (I forget the brand) I also have many live plants and I heard that they eat the little organisms that grow on them. I feed about 6 small meals daily. I'm no expert but this is just what I've been doing.
Good luck and post some pics if you can
Oh also I turned up the temp to 78. I hear that a slightly higher temp speeds their metabolism and growth, again it's just something I heard not sure how true it is or not...