Setting up Port QoS on Powerconnect 2808

I am not a networking guru.

I tried following the guide... and managed on my own to figure out how to Telnet in, activate the web control panel, and then access that via the web.

Now here is what I am trying to do, it is not that complicated.

We have a FIOS connection with 5 IPS: FIOS comes in as Ethernet, without DHCP.

What I want to Assign to Ports on the Switch:

1) Uplink to FIOS

2) VOIP PBX

3) Point of Sale System

4) Internal Network

5) Public Wifi

6-8: Not in use

Each of the above 2-5 will have a router connected to the switch port, each is a separate segregated network, with its Own public IP.

I want to configure the switch to prioritize traffic in the following manner:

Port 2: VOIP: Always gets TOP priority, then Port 3: PoS (but not that important), then port 4: internal (less important), then port 5: public wifi (least important).

If someone could give me a quick howto, im sure I will be able to implement it. I thought a managed switch would be easier to setup... I'm sure I just do not understand most of the terminology.

Thanks