Hi Vark
Look under my name (mfred) at CMMODS http://cmmods.greenasjade.net/ for the unit files I made. They will allow you to easily see which unit you mod and which ones still remain not modded.
I don't follow scenarios for modding, I just find the mods I like for each unit and apply them. To make it easy on yourself and to get a good start on modding, install the following mods and then browse for alternatives at your leisure.
Author
MikeyD - covers most of the main vehicles for CMBB and CMAK
Andrewtf - uniforms, half-tracks
Tanks A Lot - buildings, terrain etc
Gurra - terrain
Captain Wacky - low visual grid open ground
That is a good start and then you can go on to Uncle Tgt, Pat, and DavidInglett to name only a few for another vast variety of mod options . . . You'll be a veteran by then
I don't use sound mods, but others enjoy them.