For safety and training/practice make sure that the weapon is unloaded.
On a pistol – Index Point (IP) is going to be as high up in the tang of the weapon as possible. On a revolver, the hand will ride as high as possible on the back strap, but NOT interfere with the rearward travel of the hammer. The trigger finger will be aligned (indexed) along the frame under the slide. This prevents the possibility of the finger getting into the trigger guard and onto the trigger. This also allows the last three fingers to wrap around the front of the stocks of the pistol. Our second IP (for me) is when the top of my knuckle at the base of my index finger contacts the bottom of the trigger guard. This allows the four fingers of my support hand to wrap tightly around the three fingers of the shooting hand. This forms a good firm grip on the stock of the pistol. As the weapon pushes out toward the target my shooting hand thumb comes over the top of my support thumb knuckle completing the grip on the pistol, allowing for maximum frictional grip on the pistol/revolver. With both thumbs pointing toward the target, this allows for maximum lock up of the wrist and forearms.
So putting these things together for the draw, with a holstered weapon, we want to be very quick to the gun – think of trying to snatch an egg off a counter without breaking it. As we get close to the weapon we decelerate, hit IP#1 – sweeping any cover garment out of the way, or releasing any retention device on the weapon, then accelerate, pulling the gun from the holster straight up and rotating toward the target. As we start to drive the weapon toward our target, under your dominant eye, your support hand which has been a receiving position under your dominant eye hits IP#2 continuing in a fluid motion toward the target with completion by obtaining IP#3. The weapon having been driven into the eye target line should break the shot as you reach extension toward the target. Then using proper follow through, complete the shooting cycle.
Reverse the draw stroke returning the gun to the holster making sure your trigger finger stays well away from the trigger.
After some dry fires, get out to the range and get to work. Strive for consistent 1.5 draws, or better.