Action script in my game.

While making the game we are going to need to know how to do several things in flash.  We are going to need to know how to make money count down as the appropriate movements (or unit is) are being made or placed..  We are going to need to know how to make an object lock into place and not be able to move until the game is restarted. We are going to need to have select place on which the units can be placed and then the appropriate amount of money deducted and bar on the bottom increased.