Help a beginner who is about to install cyanogenmod 13 on a samsung Galaxy Note 10.1 2014 edition
FIRST in twrp go to BACKUP and backup your device so if anything goes wrong you can RESTORE and start over. 

its very simple copy the cyanogenmod .zip to your sd card. then boot into twrp and goto wipe and select advanced wipe and and delete system,data and boot. dont delete recovery or sd card. then go to the main twrp screen select install and locate the cyanogenmod .zip and flash away. you well also want the google apps knows as Gapps. i recommend flashing them after cyanogenmod then once both are flashed do a factory reset in twrp, i know sounds dumb but gapps has issues and if you dont factory reset you will get a Play services has stopped message that will spam you screen and or a startup wizard had failed. any questions shoot me a message or reply.