BEFORE INSTALLING, UPGRADE your CWM Recovery to v184.108.40.206 or higher using ROM Manager App from the Play Store. Also if using TWRP, use Goo Manager app to update to v220.127.116.11 or higher. Otherwise you will FAIL during install! You can also install CWM Recovery manually here.
To install, reboot into recovery, make backup ROM, wipe data/factory reset, install ROM, install Gapps, and reboot. (If for some reason you end up in a bootloop, reboot into recovery, go to Advanced Wipe for TWRP or Mounts & Storage for CWM, format/wipe /system, then re-install ROM.)
Download Flash Player APK (if you want flash player use with Dolphin browser)