Sand down the wood to remove any splinters, stains and impurities as well as any residues. Wipe the wood down with a clean, moist rag after sanding to remove any sawdust.
Cover each panel in a coat of primer and allow to completely dry.
Paint each panel with your desired color and allow to fully dry.
Attach casters (wheels that go under and add stability) to the bottom of each panel, using your drill to make a pilot hole and then screwing them into place.
Install hinges to the sides of the panels so that the entire room divider can be folded up and set aside as needed.