How to make a drag and shoot

Hi, I am trying to make a game where you drag and shoot projectiles; similar to angry birds and balls.

How would I make this shooting effect, or where can I find a good tutorial. It would also be cool to make the little dotted line effect. Thanks.,q_auto:good,w_600/oxls0zbq5fr1z6nblfsq/all-you-need-to-know-about-ballz-the-newest-addicting-mobile-craze.jpg

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no one know about this ?
i searched everyehere >>>>>>>>>