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You could set a point when the user clicks and then set another when the user lets go of the screen. Then angle and scale a line to join these two. Then you could work out directions and such from that.
You could make a custom timer and use that to determine the time that the finger was held down. Then use that to determine the speed of the football or whatever aspect you are flicking.
You will need to record the users touch path and speed, then translate that into something you can give your ball to move (all within a few milliseconds.)
I'm sure I saw a mouse cursor speed example somewhere on these forums, so perhaps you can translate that to use the multi-touch object instead.
As for the angle of the shot, a simple angle calculation between the first point of the touch and last point would probably work.
Not sure about spin 
For the spin, you could position an active object on the point where the user starts their swipe and then position two other actives left and right of this. If the users hold lets go on these, you could curve the shot.
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Almightyzentaco (Fusion 2.5 Tutorials)
Captain Quail (Firefly Tutorials)
