Chris
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Welcome Jack,
The best place to start is by reading the related articles on the site. I would suggest Bill Blohm's article, "Slinging advice for beginners" and my article, "A simple guide: how to sling".
The second thing I would try is making a larger sling (if you haven't already made one). I prefer slings about 3 foot long. I've heard the ideal length is the distance from your heart to your left hand.
Also try heavier projectiles. While marbles are good for smaller slings, I recommend trying heavier projectiles, like golf-ball-sized rocks. The added weight often helps you get a better sense of position, and thus release angle.
Let us know how your fare, Chris
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