Before you begin, make sure that you've backed up your data. You will lose your apps, data, messages and contacts. And if you want to change back to ColorOS, that is always an option. The ROM weighs in at 389MB and you can find all of the information and files you need to load CyanogenMod on your OPPO N1 by clicking on the sourcelink.
source: OPPOForums via AndroidCentral