Milk storage...

Deanna • Im a FTM to a baby girl born April 29 (after being told i could not have children) i plan to stay at home with her :) and im pro breastfeeding!
So i plan to breastfeed my baby, but i dont know very much about the storage part. Im getting a pump from my insurance company (i dont know what brand yet) do you have to have storage bags specific to the brand or are they universal? And if so what kind and how many...where is the best place to purchase? PLEASE HELP lol