Hm, well, you've obviously seen what a properly fitting tee and a pair of jeans would look like, and the same principles apply with the chinos -- although some people like stacks with their denim, and you wouldn't ever want that with chinos. Personally, I would try to get something slim cut with a nice taper and at least a half break or no break at all.
Assuming these are the typical tan/sandy chinos, pair them with neutral and natural colors: white, grey, black, softer reds and blues, that sort of thing. Stripes or dots are cool, but I'd stick to monochromes for the patterns lest you end up looking like a sailor (which is fine in the summer, but not so great in fall/winter).
Brown chukkas, ankle boots, mocs, bucks, or minimal low-profile sneakers (something Jack Purcell-ish) in white or light colors. I have a weird aversion to black shoes other than boots, heh.