There were 2 separate sessions on QGIS with fully written out instructions that you can follow to learn about. Depending on your knowledge base, start where you want.
https://paper.dropbox.com/doc/QGIS-1-Spatial-analysis-for-beginners--CK7MLmnPCv6cyC2ldvChh5sRAQ-uvjZbFlTN3cRbi4infpQA
https://paper.dropbox.com/doc/QGIS-2-Analyzing-geographic-data-atj9nstA9nQPhSWYqahh6