This might be PRIQ if it has priority levels.
Queue based QoS is pretty bad for gaming. I wouldn't recommend it.
You're going to need to know the default for any. It's probably *.
If you want a specific device to have a queue you make the source ip specific and everything else * from the LAN port.
To make only certain traffic from a specific place do the same above but put a port on destination.
Source ports should always be any on the LAN.
I wouldn't recommend anything on the WAN side. Unless you are port forwarding you won't have any WAN connections really.
You can't control how UDP comes in really, but TCP relies on acknowledgement packets. So when it's slowed down new packets aren't sent until the acknowledgement is sent back...