I couldn't clearly see how the world was divided between the two blocs so I colored in a world map to check that out. If click on the link you get a full-resolution PNG that you can easily edit. Might be handy for you Frymonmon, as I request detailed goings on about the war
The map is pretty accurate in terms of main combatants but I have no idea how the world is divided in spheres so there might be more fronts that we can see here.
The image shows us a few things:
-The Western Hemisphere will be quickly secured by the Allies, as the powerful American military can easily swoop in and take those remote colonies. If Canada is part of the Central Powers, than they'd have more work to do, but I imagine it'd just be a matter of time
-The front in Africa will quickly stabilize as well, with West Africa going to the Allies and East/South going to the Central Powers. The only major operation will take place in Egypt, where both sides will fight over control of the Suez Canal
-The Central Powers are in firm control of the Mediterranean, controlling Gibraltar, Malta, Crete and Suez. This will help keep contact with the colonies as the Western African coast will quickly become inhospitable
-Austria-Hungary will be in danger of being cut off from her allies. One strong push through the Alps and the Austro-Hungarians would have to fight a two-front war on its own
-The Baltic States, while close to Moscow, would not be a suitable ally for the Allies. germany would quickly occupy Denmark, blocking off sea access. The Russian army would do the rest. They are helpful as neutrals because they help create a bottleneck between Russia and Germany
-Ukraine would be an ideal ally. Keeping Russia and Germany small would be in their advantage and they could quickly cut off land access between the Russians and the Germans
-The other ideal ally would be the Ottoman Empire. While a shell of its former glory, it has much land to regain and is an ideal situation to take Suez for the Allies
-The Dutch East Indies are completely isolated and without aid will quickly fall unless the Californians join the war on the side of the Allies. The Californian navy can take at least Japan on its own and its many islands allow for a slow retreat if possible (reverse OTL WWII Japan). The US Pacific fleet could help even the playing field
-The Californians don't have a choice, with the US on its doorstep. Either they stay neutral or they join the Allies.