To store your ink pads first, make sure they are closed tight. If open, even a crack, they will dry out. Second, You need to store ink pads upside down, so the ink is on top of the pad when you use it. This is why Stampin’ Up! makes their ink pad close in an upside-down manner. Last, store flat not on the side; it is best to have some ink holder to hold your pads flat.
Stampin’ Up! has storage products to help you with your storage needs. Here is one of mine; this is on my workstation, and for projects I’m making, these are supplies I need.