Newbie! How do I stock my Camper?

I started using those soft sided packing cubes for travel. Get the ones with a handle on the end. They work to keep clothes organized in cupboards (you can use a different color for each family member). I also use them for shore power cords and adapters, extension cords, fresh water hoses, electronic device cables and connectors, spare batteries, and even as a "junk drawer". Because they are soft-sided, they don't take any more room than their contents, but they make it easy to grab a cube and go. I gained more than one full cupboard of space with them.