You will need some drawers, a file cabinet, shelves, or cupboard space suitable for these items. No major swings in temperature, such as can happen in garages and unfinished attics. Medium humidity - not too dry, not too humid. Keep records away from steam coming from bathrooms and kitchens, and from humidity produced by air conditioners and washers and dryers. No direct sunlight or fluorescent lights.
Light does more damage than either water or fire.
Ultraviolet rays from the sun and from fluorescent lights cause photographs to fade and paper to yellow and become brittle. Away from water pipes that might leak. Not touching basement cement floors from which they will draw moisture. Dirt-free, and relatively free of dust. Away from car exhaust, which mixes with humidity to create sulfuric acid.