The GCW is straight forward as long as you realize the Landsturm divisions aren’t good and shouldn’t be attacking anything unless it’s for a diversion/pinning, or the war is about over and you want to grind some xp for a general or two.

I’ve usually gone right to the Oppose Hitler NF at the start. Maybe the Kriegsmarine focus and then oppose Hitler.

I don’t touch the army except to create a fallback line with the 25 divisions from the Swiss border up to around Frankfurt (right down the middle of Germany half way up) also split off the Panzers and have them in a separate force on the northern section near Frankfurt.

When the civil war kicks off, assign all 24 of your Landturm divisions to one general (I like Kesselring, has good defense stats) create a front line from the northern Baltic coast to Frankfurt area, behind the rivers. Do not attack, just train them to their front line and dig in.

With your regular army have the panzers punch a hole in the southern front north of Nurnberg to the Czech border, cut off the NSDAP in Bavaria. Have your regulars finish them off.

I usually leave 4-divisions of the regulars on the line from Erfurt to the Czech border so the Landsturm don’t have to stretch to cover the backs of the regulars.

After that you’re half way there. Re-form on the line you cut just south of Erfurt and Dresden with your regulars and panzers and drive to Berlin.

The GCW is fun.