The correct way to hit the forehand or backhand volley is with the continental grip. Your volley will stay low and you'll force your opponent to hit up, typically from below the net. This will then give you(singles) or your partner(doubles) an easier return shot from which you can then hit that ball down. In a nutshell, that's the simple essence of what doubles is about. Think about the return trajectory. If the ball sits up your opponent(s) have more time and options when hitting the ball. When your at the net volleying you want your shots to stay low.
You can't get backspin with the Eastern Forehand Grip. See the backspin piece below. The backspin is only accessible to you by volleying with that Continental grip. Wherein the racquet face becomes slightly open at contact, by the way you hold the racquet. This is what the Continental grip affords you for the volley. You'll see the diagram in the picture below where the racquet face is open. See the practice exercises also, you could do them in your room. No need for a court. I gave these same exercises to you last year in the blog.
