It isn't any great secret. I did them originally for Megablitz, but in fact it works for any one base = one battalion set. The only real questions are how you treat the divisional assets (AT, engineers, AA, recce etc) – as battalion sized blobs, factored in or broken down into company sized support elements. Different rules take different approaches, but of course the safest thing is to buy lots of extra options to cover all the options:)
KISS Rommel has some sensible suggested organisations, but the more standard units like British Infantry Divisions are easy – HQ (or or two stands, depending), logistics (various trucks etc, if you want), engineers, AA regt, AT regt, three field regiments (one stand per regiment) and three brigades each with three infantry battalions. You may or may not want to model brigade support companies, I don't usually bother.
7th AD is a bit of a pain as it functions more like a Corps much of the time, particularly during Crusader with three full armoured brigades and a support group. Later in the war it is a bit more sensible and you have a couple of other more homogenous divisions to play with.
I usually do the recce regiments as company stands, so they can spread out, but they can be used as battalion stands if needed.
The Panzer divisions are an odd collection of stuff, particularly early in the war, again it mainly depends how you want to model the support elements and all the attached AA/AT weapons. The core of each division is a couple of panzer battalions and a single motorised regiment (five stands, if you are going very minimal!).
Italian infantry 4-6 battalions, weak artillery regiment. Some AT and engineers if you are feeling generous.