I think videos are the best way to learn Tableau. The free, on-demand videos are very good. The book "Tableau 8, The Official Guide" comes with a disk that contains 13 videos. The production quality and content of these videos is quite good. There might be other, free videos on YouTube.
Please reply and provide a sample data set to accompany your question. Or, if you have a .twbx with the data already loaded and your best attempt so far, please attach that instead.
"Tableau Your Data" is a good book that covers a lot of ground if you are new to Tableau.