storing supply for the first time

Cali☀️
So I would like to start storing my supply and I have some questions. 
Are the storable bags able to go in the freezer? 
If I pump some and store it, then pump more later that day can I put it in the same freezer bag?
Is my freezer good enough to store my milk? And how long is it good for? I'm not sure on my freezer temperature. Where do I put it, in the back of the freezer?
Thanks !