Easy Arrows will auto-orient built-in arrows, or custom graphics & compositions, to your Shape Layer path. You have complete control over the styling of the path & the attached objects, even after the script has been run.
Arrows animating across the screen. 

Arrows animating a plan of attack on a European battlefield.   
Long arms with pointing hands animate on screen.
Until now, creating a basic animated arrow in After Effects required complex expressions and parenting. With Easy Arrows, you can create a flexible auto-orienting setup in just 1 click! Seriously, it’s this simple: draw a path, then click "Create Easy Arrow". Literally less than 5 seconds.
Now you can focus on more important things, like actually animating.

Home Page - http://aescripts.com/easy-arrows/