World War I Breaks Out in 1905 or in 1906

I'm not sure if the plan was for an overwhelming attack in the west at that stage plus Russia is in turmoil and Britain is far less committed to opposing Germany at this stage. Hence I suspect Germany could well win big and possibly relatively cheaply.

If it was say 1910 after the 1st Moroccian crisis then I suspect Germany would go down fairly quickly since their going to run out of nitrates very quickly without the Haber Process being developed.

  Depends on the exact details.  For instance everybody used up munitions, especially artillery shells a hell of a lot faster than they expected.  Read once that even in 1914 Germany was still suffering because the Haber process wasn't industialised enough and would have suffered a serious crunch on munitions but for a large stockpile of nitrates taken when they seized Antwerp.  As such a shooting war starting in 1910-11 could get very difficult for them.  Although they would probably put more effort into developing Haber production faster not having enough artillery at key points could be a serious problem.

  Also as I said France has a far superior plan compared to 1914 so any German successes in the west are likely to be more limited.  Similarly I'm not sure when Belgium last updated its forts, especially Liege but the artillery that smashed the defences there OTL were only just about entering service so the German army could be seriously delayed there.

  Another factor is that this conflict would pre-date the Balkan wars and possibly the Italian-Ottoman conflict.  The former would mean a larger Ottoman empire but without the OTL reforms after its defeat and also Serbia, Bulgaria and Greece were all allied against it.  As such if either as part of the larger war or in parallel to it the 1st Balkan war occurred the Ottomans would probably still get pasted and the allies might well support the assorted Balkan powers.  If Italy and the Ottomans are already fighting this further weakens the Ottoman position and removes Italy from play for a while.  As such the straits are likely to stay open to Russian trade or if the Ottomans join the CPs their likely to be jumped on quickly.  [Furthermore the Greek king, who I think was assassinated in 1913, was more friendly to the western powers than his successor so in any such conflict in the region an isolated Ottoman empire is in for a very hard time].