Complicated character movement help plz

[COLOR=black][FONT=Verdana]I am trying to make a top down tower defense style game where the computer constantly moves the player’s characters forward and the way a player controls his character is by selecting one of these characters and then pressing an arrow key (so if a character is moving left and the player selects a character and then presses right the player will then start moving right). Also I want to give the player the ability to drag and drop a character to quickly move them from one side of the screen to the next and i was wondering if anyone knew any tutorials that could help me figure out how to program this in action script 2.[/FONT][/COLOR]
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[COLOR=black][FONT=Verdana]I already checked out a couple tutorials like snake and nanowars but the snake tutorial doesn’t allow for multiple snakes to be on the screen at once.[/FONT][/COLOR]