Confused on missile skill?

Hey!

I've been trying to create a homing missile that is clearly visible and is an ender pearl with a dragon breath particle trail behind it (and make it go quite slowly)

I've been looking at the section on the missile skill on the manual but can't seem to make it work.

If someone could do this for me (I assume it's quite easy and it's my rubbish skills lol) I'd be very grateful.

- Agent

EDIT: I want it to do damage on impact with the player