Many fishing kayaks have one dry storage area as well as one tank-well (this is a compartment that holds points which could splash, such as a lure pail or a cast net). If you plan on doing longer, multi-day excursions, it could be a great idea to try to find even more dry storage space.
Finally, the color: select whatever shade kayak you really want! The fish will not be frightened by a specific color, so decide on whichever one you such as. It could even be better to choose a brighter color, since that will make you much easier to situate in an unexpected emergency as well as even more noticeable to various other boats.