Charge towards target location?

[X-maul]

I want to make an ability that makes the unit charge towards a target location;

• The unit needs to channel for 3 seconds (prepare time I guess).
• Charge towards the target location with 10 speed and leaving behind a trail of dummy units with a damage aoe behavior (1 dummy unit every 0.3 range).
• Create an explosion effect upon reaching the target location.

I dont need to know how to create the explosion effect, or the aoe effect, I just need to know how to make the unit charge towards a target location with 10 speed (and not be interruptable) - and spawn dummy units only while traveling.