Take a look at the QoS SRND linked below. Specifically, see the Campus QoS Design specific to your model of switch and the WAN Aggregator QoS Design section. In the WAN section, look at the WAN Edge Classification and Provisioning Models section as well as the WAN Edge Link-Specific QoS Design specific to your link technology and speed.
http://www.cisco.com/univercd/cc/td/doc/solution/esm/qossrnd.pdf
Hope this helps. If so, please rate the post.
Brandon
