[help] phone gone nuts!] topic

Please help me solve my issue i cant root my phone.

So i downloaded everything i needed:
Odin
TWRP 2.8.4.0
Google USB drivers
ROM (lollipop)
SuperSu
Gapps
img to tar tool

So my issue is:
When i want to go to recovery mode it says No command.
So i guess i have to install TWRP with odin.
But when i go to download mode, after a few seconds it goes to Firmware Update (B31) and its always at 0% (The phone is plugged in to the PC).
What should i do?