You have one pedal that doubles as the clutch and the brake.
The clutching is nothing more than making the belt go slack so it slips on one of the pulleys ( usually engine pulley ).
The brake, you have already worked out.
Generally the brake lever is moved by a spring on the rod which has an adjustment nut for adjustment.
So you can adjust the brake so it comes in just as the clutch releases.
There is a second adjustment on the brake arm itself, that is the big nut on the brake lever, it is very sensitive so you move it little bit , then check.
Ideally if you are on a hill pointing upwards the clutch should engage and drive you forward before the brake releases fully and allows you to roll backwards.
I have a lot of very old people iny repair run and am forever backing off brakes & adjusting clutches to be less severe as most have bad backs.
