That's what I did, I just ended up keeping a few baby angel fish and donating most of the rest to a local fish shop. I sold a few by advertising in the local free classifieds, but that was a hassle for what little they could be sold for. I can get a bit more for my baby parakeets. You can always advertise them for free if you don't have a LF Store that will take them. If you do have a fish store that will take them, they might even do a little store credit. Or do as Phreeflow suggested and see if someone online will swap out for them.
As nature's way, some of the weaker may be culled out even to the point of their own siblings harassing the smaller ones to death.
Still it's a fun first time experience and a quite a few will survive without you having to do much more than frequent feedings with First Bites. You might set up a small extra tank for them, using borrowed substrate, filterpad, and water from your original tank to jumpstart the biocycle--beneficial bacteria. It is also gratifying after your diligent feedings to see them as they develop from nondescript minnows into little angel fish. If the parents are distinct in colors and patterns it is interesting to see what variables develop in the offspring of a mixed pairing. You will end up with a few or at least one beautiful or very distinctive fish.
>>I bought a reasonably priced digital weekend fishfeeder that had settings for multiple days and multiple times per day. This came in handy later also, for when I was away for feeding my adult fish. Practice food dosage amount setting first over a paper towel. Make sure the food dispenser isn't set up over or near a bubbler or filter, as splash up and condensation can moisten the fish food, causing it to goo and possibly plug the dispenser opening or not allow the food to properly issue.