I don't know if this guy is fro real of not but if you really want to keep baby fish, or really any fish at all you have to plan ahead. Baby fish eat tiny animals, i culture Daphnia magna, they are easy to grow and all fish eat them, from baby pickerel to baby paddlefish everything eats daphnia.
Tiny pellets like hikari micro pellets are good too for some fishes. you made some really amateurish mistakes, but we all have at one time or another. if you plant o do this again plan ahead, grow daphnia, sponge filters can be used to transfer a working bio filter from one tank to another. outside filters can be fitted with a sponge prefilter to keep tiny fish from being swept up.
Lots of help here if you want it, this forum has some really knowledgeable people, use the expertise of the members to try and not make the same mistakes and to avoid making them again. As for how old you are, that is irrelevant, read books on fish keeping written by people who do have the expertise. many people here have been keeping fish for 40 or more years, oh how I wish i had access to such a knowledge base when I started out at 8 years old...