The grip principles are the same for right and left-handers.
For a right-hander the left hand should be at the top of the handle - vice versa for a left-hander.
Check both your hands are fairly close together on the bat, towards the top of the handle.
Form a "V" by pointing your thumb and forefinger down between outside edge and centre of back of bat.
The top hand rests comfortably on the inside of the front thigh (left thigh for a right hander).
And the back of the top hand should face towards extra cover.