I want to configure PulseAudio to get better sound quality because right now it's pretty bad.
I saw a tutorial but I can't do it because I don't have so much knowledge of how linux works.
You can try pulse EQ, it's by far the easiest method for better audio quality. Located in software center, synaptic or on webupd8 website using a ppa. I found the eq does a great job adding bass to my crappy headphones