I would probably start at the beginning. Here are a couple threads that will guide you:
[DEV/CWM/ROOT/ROM] Hisense US/UK Sero 7 Pro CWM Touch, Stock ROM & XE-SeroROM v?.? - xda-developers
[Q] Hisense Sero 7 Pro Rooting - xda-developers
Finally for any of the 4.4 ROMs you will need selinux...