QoS Policing Configuration Example

Good Day ALL,
How can an access-list be attached to a policing policy ? An example of my configuration is listed below. Not sure if I would get the desired results. If I have a 200meg link , but only want to use a maximum of 50mbps for wireless users from a specific network. Would I use the 50mbps for the cir or the 200mbps for the cir ? Any guidance is greatly appreciated.

ip access-list extended 100
permit ip 192.168.1.0 0.0.0.255 any

class-map TEST
match access-group 100

policy-map TEST2
class TEST
police 50 or 200 for cir ? conform-action transmit  exceed-action drop  exceed-action set-dscp-transmit 0 violate-action drop

int fa0/0 
service-policy input TEST2 

-Thanks