im relatively new to heroclix, only been playing for a month, but i wanna make a team with the keyword brutes. point total would be 400, and Id like to use cain marko and mourlin if possible.

Well, do the math...those two are almost your whole team right there. Use the excellent Units section here to search by keyword to find cheap pieces to fill the 65 points you have left over. (You'll need two more characters to make it a themed team for the Brute keyword.)