1. Wide base
(at least shoulder width apart). A wide base will provide balance on each of your shots. With feet close together, it often becomes easier for your body to shift its weight from one side or the other, creating an off-balance and inconsistant shooting form.
2. Spread Your Fingers On The Ball
- This will provide better control over the ball as you prepare to shoot. The ball should not be resting on your palm. Rather, it is much better off in my experience to have it resting on the "pads" of your fingers.
3. Keep Your Shooting Elbow In
- You already mentioned this, and it's true. I picture shooting a basketball like launching a catapult. Your strong hand is your shooting hand aka your catapult. I would not devise a catapult with a crooked arm. Instead, I'd have it flinging in a directly line toward my target. That's what you want out of your shooting elbow. An elbow square to the basket provides additional power and consistency.
4. Use Your Off-Hand As A Guide, Not A Second Shooter
- When shooting a basketball, the job of your off-hand is ensure the ball is stable on your shooting hand. Imagine trying to get off a shot in a game while only using one hand. The ball would be unstable, yes? That's what the off-hand is for. It can rise with your shooting hand, but it's not being used to propel the ball itself. It's just going to make sure the ball stays where it's supposed to until it's released.
5. Follow Through
- Regrettebly, I once told my players to think "Oh Snap" when they released their shots. This was to remind them to follow through and snap their wrist as they shot.
I don't exactly know how to explain why such a follow through is effective, but it is. It seems to ensure the ball follows the path you desire. Snapping the wrist (making it look like a duck's head) seems to provide a proper backspin on the ball, improving the range from which you may be able to shoot as well as providing a nice "touch" to your shot.
6. Jump Straight Up, Straight Down
- Often, developing shooters tend to lean or drift or fall away any time they're not stationary prior to setting up for a jump shot. Regardless of situation - running off a pick, spotting up, pulling up on a fast break, shooting off the dribble - attempt to achieve your standard form. The idea is to keep things as simple as humanly possible. You want to teach your body the right way to shoot, then develop ways in games to put yourself in position to get off your desired shot.