Hey Mike good to see you too!
No secret on the basing...
Rules are written to avoid ANY rebasing of existing collections but if anyone is starting from scratch my recommendations are:
15mm frontage for infantry
20mm frontage for cavalry
bases depths to suit collections. There are many example basings in the photographs so people can get a feel for the pros/cons/look of each
Infantry operate in battalions of sizes 16,20,24,28,30,32,36,40,42,48,52 and 56 depending on what you are triny to recreate. The basic 'element' for shooting and combat is a 'combat group' of 4 models. This applies to both infantry and cavalry.
Cavalry organised in Regiments of 10-60 models(of course 60 is an extrmely large Russian regiment). Typically 16-32 depending on nationality and theatre.
All of the combat mechanisms involve 'All models fighting' therefore basing size is irrelevant.
Hope this is enough to keep you interested... go to the WARCHEST where a couple of chapters appear in draft form in MICROSOFT WORD. They are much amended and edited since these roughs but the principles hold true!