While storebought shelving
is useful, you can create custom shelves using plywood that you stain and varnish. To make a shelf bracket, cut a triangle shape and a square mounting plate from ply. Use PVA and screws to attach plate to triangle. Repeat to make desired quantity. Cut ply shelves, to suit. Screw plates to wall then position shelves. Top tip? Measure up storebought shelving to help determine size and scale.