You may like to watch Pete Sampras video at
www.tennisplayer.net. This is the best way of learning.
Here are some pointers:
Grip: Eastern FH grip. The base knuckle of the index finger on the right panel i.e. panel 3.
The stance:
Square: Right foot at 6 left foot at 12 o clock positions.
Open: Right foot at 3 and left foot at 9 o clock positions.
The stance is dictated by the hitting situation. For wide ball use open, for normal ball use square.
For hitting cross court you may use open stance, for hitting down the line you may use square.
It is also possible to hit both cross and down with open stance.
As you see the ball coming to your FH side, your left arm should aid in pushing your racket back and up in a loop C, with that your upper body will also turn. If done correctly, your left shoulder will be at 1230 and right shoulder be at 1830 positions. The tip of the racket will be higher than your head. Basically, it is a high backswing.
From this high position, the racket will descend, and will move forward into contact. As you initiate your forward swing, your wrist should be relax and laid back.
The contact is out in front, between your knee and midsection, the racket is vertical at contact, you hit through the ball as if you are hitting 3 balls in a row, and forward-upward follow-through generally over your left shoulder.
At finish, your right shoulder should replace the left shoulder.
Watch the vid at tennisplayer.
Mahboob Khan