Unit organisation for Pike and Shotte

[MediumAl]

Currently painting some units in anticipation, but I'm not sure how I should be organizing the units. So far I have painted 2 units of 48 Imperialists, half pike and half shot, but they are not entirely uniformed so I've allowed for the possibility that I'll be mixing and matching.

I understand that organization changed through the war, but if I were to go for Wallenstein's army in the early 1630s, how should I be organizing the units and what formations would be appropriate. It would be good to have the thoughts of the authors if they could give us a heads up in advance - he says hopefully!