Here in Missouri, with crappie and bass, I use Andy's seasoned breading. It's like corn meal with different seasonings. I really like the Spicy bag (bright orange).
Wash the filets (boneless, if possible) in clean water and put them in a bowl of cold, clean water. Take a filet out of the water and let let it almost stop dripping, then drop it in the breading. Roll it around in the breading and coat it really well, then set it off to the side on a plate. The breading kind of "melts" together as it sits there. When you have a few breaded filets, test the oil before you drop them into it (400-425 is the correct temp, I think). The oil has to be hot enough, but not so hot that it's smoking. Peanut oil is great if you can get it, but we usually use Canola oil. To make sure its hot enough, put a little drop of water in it. If it snaps and pops and throws grease everywhere, its hot enough. If the oil is smoking, turn down the heat and wait a bit before you drop in the first filet.
As the filets fry, they'll clump together, so you have to use a spatula or slotted spoon to keep them apart. You have to keep adjusting the heat as you fry up your filets. Each batch will lower the temperature a bit if you don't pause between them.
Now, here's the secret: You have to leave them in there until they begin to float. Then watch as the amount of "bubbles" begins to die off. If you leave them in too long, the bubbles will stop and you'll have a dry, chewy filet. If you take them out too soon, the fish will be rubbery. I like to pull them out when they're just "sighing" bubbles around the edges. Take a fork and try pulling one apart. If it flakes and steams, you've done it just right.
Place the filets in a pan with several layers of paper towels to abosorb any excess oil.
MMmmmmm gooooodd, dontchaknow.