Start with the look you want, then select the appropriate product family and exact product. Manufacturer shade names, codes and colour tools should always be treated as manufacturer-specific data.
Explore whites/off-whites, neutrals, yellows, oranges, reds, purples, blues and greens as a discovery starting point.
Compare matt, soft sheen, sheen, gloss and other finishes only where the exact product source confirms the finish.
Choose the finish based on desired appearance, cleaning/washability requirement, room use and the applicable manufacturer system.
Consider weather exposure, dust/algae resistance, durability and the manufacturer's exterior system before choosing a finish.
Wood and metal finishes are separate coating systems. Do not use wall-paint assumptions for these surfaces.
Colour is secondary to solving the water/moisture problem and following the correct waterproofing system.