1) Get yourself an aroma wheel...this will help people come up with descriptors of what you are smelling...I have seen a downloadable version, but can't seem to find it now. The real one was done by Dr. Anne Noble at U.C. Davis and can be found at her website. Also download some tasting sheets...they help organize your thoughts on color,aroma,taste,etc.
2) Try to limit your tasting to one thing. You could choose Syrah from several countries, or Syrah from the same country, or Syrah from the same Viticulture region (AVA in the US). Or even Syrahs from the same vineyard, but made by different winemakers. Every winemaker does things a little different...see if you can taste the difference.
3) Do some research on each wine...what was the growing season like for that vintage...what kind of barrels did the winemaker use (French,American,Hungarian), did they pick at a high degree of ripeness or pick early? Sometimes this stuff is hard to find, but it's worth a shot.
4) Get a good book to learn about the different regions, what are the characteristics of these places?
5) Have fun.
Steve