There are multiple ways to start to the backswing, as it all depends on the feel. Practice different methods and see which feel works best for you.
Everyone swings different, but there are players who make it obvious they know what they are doing.
When you swing, force should be moving from right to left.
RESPONSE TO COMMENTS on AM | 2019.36 | 02. RE: What Do You Think About Locked Left Arm Putting Strokes - 20190906 // Feeling the club face is very important. Practice getting your grip to where you can feel where the club face is.