How do you debated a Muslim?

[Tonus]

There is a guy at work who is a Muslim, and he will not let me me get in a word in.

If he's that inclined to shut you out before you even have evidence to debate with, imagine what he'll be like when you do. I think it's a waste of time to try and discuss the issue with someone who seems so terrified of hearing a contrary point-of-view.

Also as I do not who the Quran, what are the pages that show it's not a religion of peace but of its a brutal religion?

I think it's a bad idea to try and debate a religion without a good grasp of its teachings. It won't take long for him to rebut your claims with information that you aren't aware of, and that will simply reinforce his belief and give him the impression that you're less interested in teaching him anything and only interested in 'proving him wrong.'

If you're willing to invest the time, learn from him. Ask him about his beliefs, and what they're based on. Discuss those beliefs with him in a genuine fashion. You'll learn about his belief system, and in discussing it he may begin to find holes in his own logic. Worst that can come of it is that you have a better understanding of Islamic beliefs.