Gyro Code: Will this work?

Technical C/C++
1

This is my code

if (!rightstick.GetTrigger()){
			float angle = gyro.GetAngle;
			myRobot.Drive(-1);
		}

my goal of this code is when you push the right trigger the gyro tells it how far to turn

two questions

1)Am i correct on my assumption?

2)What are my inputs to make my robot turn, like 30 degrees or 180?