I always think when I am trying a new tool to look at how someone else used it through a tutorial. It is hard to recommend a specific one without knowing what you are tracing so here is a general one and I hope this helps: http://www.smashingmagazine.com/2010...tch-to-vector/

Another thing I would recommend if it not a photo spend a few minutes in your fav. bitmap editor and clean up your drawing. If it is a line drawing have a look at the Threshold you might want to increase the blacks to get a cleaner line when tracing. Hope this helps with your tracing.