Configuring QoS on a Cisco Catalyst switch can be quite a daunting task if you don't understand basic principles of QoS and while I am not one to recommend using wizards or auto configuration this is one exception. The case here is you want to implement QoS for IP Telephony with a Cisco Phone connected directly to a port on your switch so that voice traffic gets priority over your other traffic.

Here is the best part it is just one command on a per port basics which enables QoS and auto creates the policy as shown below.

interface FastEthernet0/1
 auto qos voip cisco-phone

What this does is enables the Cisco trust boundary feature that uses CDP to discover if an IP Phone is connected to the port. When it detects that an IP Phone is connected it trusts the QoS markings in the frames & packets produced by the phone.

Reference
Configuring QoS