Samsung Galaxy Note 4 (SM-910F) to Cyanogenmod/root

Hi guys,

I bought the Samsung Galaxy Note 4 (SM-910F), updated it to Android 5.1.1 and want to install Cyanogenmod/with root.
I read a lot about it cant be rooted just with a new kernel with root permission but i want to install Cyanogenmod with root.
Normaly i need to unlock bootloader and get root permission to install a rom?
Or is in not possible to install a other rom at the moment? Or is there a way to downgrade my Android version?
If yes... Can someone give me/us a instructions to do so? Maybe with download links, i know to search the forum but i cant realy find solutions for my own questions

I know...
Samsung Smartphone USB Driver
Odin
TWRP

and...?

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