You can't go wrong with using the same color on the walls and trim, matte or flat for walls, and satin or semi-gloss on the trim. Especially since you say you are clueless about color, it's pretty foolproof. The difference in sheen will give a nice dimension to the space, as girl_wonder said. Light and shadow will make even the same color appear different enough so it's not worth it to try to find a different white.
Q
Linen
Q