Choosing what paint sheens for exterior surfaces is just as important as choosing the colors especially when painting exterior surfaces. You want to make sure the correct sheen is chosen for the siding, trim, doors and porch/deck floors that will provide the best durability. Here is a helpful link that will provide a sheen guideline for exterior surfaces:
After a client has made the correct color choice they always ask me what paint sheens for interior surfaces provide the best durability. The standard answer for interior is flat/matte for ceilings, egghsell/satin for walls and semi-gloss/hi-gloss for trim. Here is a link to the standard guidelines to follow when selecting a sheen for a specific room.