Germany 1936:
Don’t attack any Neutrals. Annex the 3 Neutrals. Build your forces up in Western Germany until you have enough to take on France. Also make sure you have a paratrooper and your air transport in Western Germany. I would also build some in Stetin to take on Poland later. Save your lightning war.
On the same turn, Attack Narvik with your paratrooper, and attack Belgium with your forces you have stationed in Western Germany. Land your air transport in Western Germany and build another paratrooper there too. The attacks on Belgium and Norway should have put France up to full income or at least pretty close, which is good for you as the German player because that’s more IPPs for you when you take Paris.
Send the paratrooper from Narvik, the paratrooper from Western Germany, and a fighter into Oslo. Attack West Poland and the other the neighboring Polish territory that starts with a D (I can’t remember it’s name off the top of my head) with your forces in Stetin. Attack Picardia with your forces in Belgium. Use your Lightning war to take Paris and possibly Warsaw.
Try to have this done by July of 39 at the latest, so that you can focus on the USSR asap.