I am sure you will find ample of information about this topic on WWW but I will share some of my favorites:
VMworld 2012 session by Frank can be accessed from herehttp://download3.vmware.com/vmworld/2012/top10/vsp1683.pdf
http://www.yellow-bricks.com/2009/11/13/resource-pools-and-shares/
If you have access to vmworld 2013 then you may also check VMworld.com: VMware vSphere Cluster Resource Pools Best Practices
Hope this helps !!