debian 12 & cuda toolkit

Hello I install a fresh Debian 12, than after update repository of non-free I follow next steps:

- apt install nvidia-detect
- nidia-detect
- apt install nvidia-tesla-470-driver
- disable nouveau
- reboot

Than it works so fine. So when I install cuda toolkit like this (https://www.server-world.info/en/not...2&p=nvidia&f=4) it was on conflict. If I continue installation when I open Blender, cuda was not detect.
I can't try run file because I don't know how pass from runlevel 4 to 3.

Thanks