need help.

first time mom here souly pumping to make her food. I mad enough I need advice on how to store and how I should do it I'm feeding her 55mm. and I made around 4 ounces or something. so I've been pumping and putting in bags and just using the oldest bags till it's 55 then back in fridge she only 4 days old and eats every 3 hours. I pump after feeding her the bottle.

if this makes sense I need help cuz now I have lots of bag and I dont want them bad but I don't wanna freeze them and then need it like in a few hours for something.

plus my milk is still coming in so I could make more so need advice