Is there a real question here? Are you just asking for high level advice?
UnityAnswers is **not** a place to come and say "Please do all the work for me & write me a script that does X Y Z."
My high level advice is:
* Use Input.GetKeyDown(KeyCode.Shift) ([see documentation](http://docs.unity3d.com/Documentation/ScriptReference/Input.GetKeyDown.html)), Input.GetMouseButtonDown(0) ([see documentation](http://docs.unity3d.com/Documentation/ScriptReference/Input.GetMouseButtonDown.html)) to find out when the user does actions that cost mana.
* Each time the user does actions that spend mana, subtract X amount from the variable that keeps track of mana.
**Edit:** Once you try to write the code yourself, **if** you have any problems, **then** you can come here to ask a question & get help.
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