NewBuilderAskin

First time settin out condos, have a place on Kerr and want to finally set some out in front of my dock and in some other 'select' places in my big cove. Water is down now at the lake, deepest out in front of me is 12 to 15. How tall should I make my condos (using cedar limbs and also buildin some of the PVC's). Figuring Id get em to maybe 8, but not sure if thats too shallow for surface. Whats the general rule y'all use for height/depth difference?! Man, Im lookin forward to getting my cove set up these next two weeks! ALso, if I set some out on Sat...will I have fish coming into em by the NEXT sat?! Im new to the crappie fishin but GOT THE BUG!! so Im tryin to learn. Thanks for all your help and everyone posting their tips here. Im soaking this stuff up!!