So I am mid way through having my stove put in

Thinking of building some sort of store for the wood, most of which will be purchased [sadly], just want to keep it tidy.
Thinking of siting it under my massive porch, so more about tidy than dry. There is potential room under my back window, about 3-4' high and up to 6-8' wide. Thinking of putting a ply or similar roof on it to put pots and stuff on, more growing space and nice under window.
How big does it need to be for a cubic meter bag of logs or reclaimed/left over timber ?
Any other features/tips ? wood up off the floor I assume.
Assuming a chopping block and axe, as well as companion set and CO2 detector are on shopping list.
Thanks
Sarah