For right hander for left hander it is the other way round:
You have to put your left hand at the top of the bat and your right hand below. Hold it tight so you won’t loos control over the bat. Grip the bat so the finger tips of your left hand will show in direction of your legs and the finger tips of your right hand fill show the other way.
Now, put your left foot over the batting crease and with your right stay behind it. Between the feet is about one foot distance. Then put the bat behind your right foot and when the ball comes, swing it over your feet on the ball. You might have to reposition yourself in order to be able to hit it