How 2 store n prepare milk.?

my daughter is 6months old n im wondering how much i should be pumping for each or daily feedings. i know all babies are different and there is no correct answer but even an estimate will be so very helpful. i also do not know how to prepare it. i obviously know that u warm it (either on the stove or in hot water - never in the microwave!!!!) and i believe that i heard that you should store/freeze it in 2oz n thaw more as needed but what about all the other little details. can anyone give me step by step what 2 do after pumping.... i have also heard that you cannot either freeze or refrigerate pumped milk immediately after pumping or you can spoil the milk. is this true? so if anyone can give me step by step on how to store and prepare pumped milk or even any tips and facts i really appreciate it.