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Don't rush out and buy a brand new ball to practice with! Using an old ball for spinning is actually better for beginners. The grooves in an older ball are worn down, making it easier for your finger to stay on target and balance while you spin the ball. Having a little bit of nail above your fingertip can help you balance the ball more easily, but if your nails are long, trim them! Long nails can get broken, or even make it impossible for you to spin. Spinning a basketball too hard or too quickly can strain your wrists or even fracture your finger! Spend a minute or two stretching your fingers and arms to warm them up before you practice. You don't need to do any special exercises. Just extend your arms and fingers as far out as they can go, and repeat a few times.
Find an old basketball. Trim your nails. Stretch your fingers and arms.