Every Southern cook has a different method. We like white meat - save the dark for stock.- here. That matters because dark meat cooks more slowly than white, so you have to adjust your timing, But in either event, my method it to marinate in buttermilk overnight. The surface is better prepared for the crust and the salt balance in the buttermilk acts as a brine.
The next step is the "dredge and dip". You build up the crust with a liquid/dry layering. For my taste, you go from the buttermilk marinade to the dry and then to an egg wash liquid before returning to the dry. Some folks go to the egg wash first, but to me it doesn't add much to the buttermilk that is already there. You want two coats of the dry for a crispy crust. The dry - or dredge - layer is a seasoned flour. I take for each cup of flour, 1 t baking powder, 1 t paprika, 1 t ginger, 1 t thyme, 1 t garlic powder, 1 t salt to make the dredge flour. My egg wash is the drained buttermilk from marinating, plus an egg, beaten. Whichever sequence you like, do your dredge and dip at least an hour before you plan to cook, to let the layers meld together,
In the frying step, folks again differ about which comes first, but most everybody agrees that 2 different steps are needed: a hot fry and a low fry. My best success comes from frying the pieces at 375 until essentially golden done, then holding in a separate skillet at about 350 till finished. My grandmother used to start hers at 340 (outrageously low to me) for quite a long time, then flash finish at 380. Both of ours wow folks.
HTH