How do I mount the T-bracket for the QS8's on the wall?

I know I have to find the stud with a stud finder, right?

I don't know how to put a screw on the wall. Do I just use a Phillip screw driver and start turning screw on the wall? Or would I need a Drill? I'm just really confused, because I never mounted these sort of things on the wall before.

You advice would be appreciated thanks!