Pretty simple concept - main rotor torque wanting to twist the body of the helicopter in the opposite direction is countered by a fan on the end of a stick - your tail rotor - which provides a sideways force.
In the absence of another force pushing the other way laterally, the machine will drift sideways. To counter that, we put in some lateral cyclic, tilting the lift vector opposite to the direction the tail rotor wants to push.
This, as mentioned above, creates a couple; high (talking about vertical position, not magnitude) main rotor force one way and lower tail rotor force the other way.
That makes the helicopter roll until this couple is exactly balanced by another one, that is, the couple between gravity pulling down on the centre of gravity, and the upward force on the 'suspension point', ie the centre of the mast.
Something like that, anyhow!