help w/Talking at a tasting..

[fraubrau]

I started working at a wine bar receintly and was asked to participate in a wine tasting.I was assigined/picked the guenoc petite sirah.It is my favorite.I have reasearched some info on the history but,I am unfirmilar with wine tastings and thier structure.If anyone has any suggestions or pointers for me I would greatly appreciate it.