You will get the basics of vee belt design from any mechanical engineering 'machine elements' design book. There will be several of these in any mechanical engineering college library. Also belt manufacturers such as Gates, Pirelli, Goodyear, Continental etc. all give free guides to toothed and vee belt design. You can find a sales representative via the web, and ask for a design guidelines book. If you have problems tracking this down I can give you some specifics.