pumping advice?

Audrey
Today I pumped for the first time. I rent a medela lactina electric pump from my pharmacy and I think it does a decent job...
I feel like it definitely takes a longer to pump than to have baby on the breast for the same amount of milk, but then again I never really knew the amount baby was drinking.
Anyway yeah.. I'm a stay at home mom so I never really needed it but I feel like I should have something in case of emergencies or to do some recipes once we start solids. But I don't know much of anything. So any advice is welcome! 
How do you go about storing milk? Directly in the freezer or do you wait until it's at room temperature?