All you need is a floating line, longish leader with a heavy butt and heavy tippet (0x or 10 lb maxima) and some dry flies, something like a grease liner, size 6, and maybe a few small to medium size black or purple classic wets size 2,4,6 and 8. Seriously I never take more than one box of flies on that river. That is pretty early in the year so probably your best bet is to talk to anglers on the water for the most up to date info. Focus on medium-depth (3-6 ft) riffles and tail outs. If it looks good it can hold a fish.