Help with WWI timeline

I'm trying to develop a timeline which divides the first world war into two separate wars in Europe.

I don't know how plausible it though so I was wondering if anyone knew what the central powers were aiming for in the first year?

For example could the central powers have been satisfied with a war with Russia without making any territorial gains in France?

How much Russian territory would it take to make the war worthwhile for the central powers?
 
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