I agree on the line counter reels, very usefull and not too expensive either. As far as rod length, we usually put the longest rods in the front and get shorter towards the back, mostly just to keep the lines separated-that's if not using planers. With planers, a6-7" MH does better. If not using planers, the long rods get the baits away from the boat a little further which seems to be important sometimes. Sonar is probably pretty important too unless you have a good idea of the water depths and contours already, you could probably get by with a good topo map instead just for depth but your sonar will mark fish and often give you the thermocline.
It's all over but the fryin'......