Read Scheduling Matters Article
http://www.airlinepilotforums.com/cargo/85820-bidding-fdx-transition-training.html
This post has same info. Union published an article called Scheduling Matters--Schoolhouse Cash from January 2014 that answers all kinds of questions on how to bid first month, last month, and months during training. Different strategies for each of the 3 cases. It can be found http://fdx.alpa.org/Portals/26/docs/010814%20Schoolhouse%20Cash%20Final.pdf