Dual-monitor setup with custom desktop environment and Compiz

I have two monitors that are both connected to my computer. I want to have them un-mirrored, and it works fine in Cinnamon (after tweaking some settings), but I can't find a way to do this in a **custom** desktop environment with Compiz. Here is the script that starts my DE: #!/bin/bash docky & compiz I'm running Linux Mint 17 (Based on Ubuntu 14.04 Trusty Tahr).