Good boots and waders for sure... There are also alot of good books available, especially those by Jim McLennan, that discuss techniques, and how to read the water. A book or 2 on basic entomology is also a good idea to get a bit of a handle on exactly what you're trying to imitate. I have a well used copy of one that fits nicely in a vest and is very detailed with pics of artificials to imitate the insects in different stages. Its called Hatch Guide for Western Streams (I think...)