Applying QoS to the incoming packets using traffic control

I have been studying about traffic control for a while now for a project that requires me to apply QoS on an application level for optimising in game experience. Now I have a few doubts that I would be glad if someone could help me out

1. Steam actually tells me which ports are required for running the games and other steam related stuff. If I block all other ports other than those ports, would it actually reallocate the bandwidth of those blocked ports to the open ports.
2. What are the properties t I can apply to my ingress qdisc to achieve this, I was planning on making udp packets from certain ports get into a priority queue, but I guess I cannot do that in incoming traffic.
3. If I put the udp packets of the outgoing traffic in a priority queue, would it help me in anyway
4. Is there any way for me to get the udp packet loss after applying the necessary filters and firewalls?

For traffic control I am using the tc utility of linux