Ok 4 days you wouldn't see much if you candle them. Are you sure she is broody is she sitting on the eggs day and nite? Only asking because you said you was new to peeps
Put the eggs back under her if they aren't broken.You may want to candle the egg to May sure the chicks are alive. How long has she been sitting? I have moved hens with eggs if I was worried about them fall out. For food they need chick starter
The mom will do it all just make sure the chicks cant fall out of the nest. Chicks don't have to have food or water for the first 3 days but I like to put food and water in with them. And just watch and make sure the other chickens don't kill them most of the time mom will keep them safe but...