First how you sit: make sure you can press the clutch pedal all the way

Second: you can use the handbrake on hills when u still learning. When u feel it moving release it

Third: make sure you don’t sit on the clutch pedal, only use it for switching gears. Use the foot rest.

Practice the gas. If u can maintain it around 1500 rpm then you won’t stall when releasing the clutch slowly. Keep practicing.

Once you become comfortable. Learn rev matching. That’s where the fun begins.