Also how do i change from a push to pull stroke?
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But, yeah, here goes the long version . . .
First, you want to first establish that your current stroke looks like this:
http://www.easitennis2.com/PowerClinic/StabilityAndPower.htm
If not, you may already have it. If so, continue on:
The "short" answer is to keep the angle on the left side of your thumb/wrist between 90 and 135 degrees through the takeback, so that you see a crease on the left side of your wrist. (Similar to how a 1H BH looks.)
Usually this means that, at the height of your takeback, the racquet tip will be pointing "forward" (or toward the net.) Rather than pointing at the sky.
But, the above is kinda esoteric, so here's a checklist:
1) Do you have a unit turn? If so, do you set your unit turn by rotating your hips and torso?
2) Do you keep your back shoulder below your front shoulder through the entire takeback?
3) At height of takeback, is your elbow pointing to the ground (good) or toward the back fence (bad)? Is racquet tip still pointing forward?
4) In your finish, does your elbow still at level or below your hand?
5) Do you "sit and lift?"
The above may be easier to accomplish with a strong SW grip. Also, it's easier to pick up flaws if you try holding the racquet with just the thumb, third and 4th fingers. Once you feel good about it, then you can move the grip over to whatever you prefer.
The above doesn't cover the WW finish or anything, just the basic feel and muscles that are involved with a "pull" stroke.
To develop racquet speed, you can work on abbreviation and shoulder turn. They actually go hand in hand, because it's really the shoulder (not the size of the backswing ) that creates racquet speed. This also works with the stroke you're currentyl using.
1) Imagine holding something small (say a penny or post-it pad) under your armpit in your takeback. You don't need to actually close the armpit (which would restrict natural motion), but you want to feel like your takeback is abbreviated, and that your shoulder is turning and mostly leading the takeback.
2) Concentrate on a lengthening or stretch in your right pec in your takeback.
3) Work on taking the back shoulder away from the front shoulder, while keeping the back shoulder below the front.
To develop wiping action you can do either of the following. This should also work with your current swing, and it can help develop more racquet speed.
1) The "standard" visualization (from Nick B's Killer FH instruction) is to imagine that, as you're initiating your forward swing, you're pulling out of a slot. If your racquet frame was between two parallel hands, you would be able to initiate your forward swing without the frame touching either hand.
2) For me, I just visualize that the right fence is temporarily close to my racquet when I'm initiating the forward swing.
From there, you have something pretty close to a WW FH. Then, if you want to have fun, then you can experiment with wrist and all that other stuff.
