Real quick trigger question

Heyas everyone, just wondering how to do this certain ability...

I seen it in quite a few maps but it mostly sticks out in tank commanders, how do you set a skill or a trigger so that your unit auto attacks? what i mean is missiles will just shoot out of your unit and hit random targets automatically, you can even run and walk around while it shoots, been trying to figure this one out for days but its killing me!
also
im trying to make do a little add on to shockwave, what im trying to do is, once the hero casts shockwave, he will instantly be moved to wherever he targeted, thing is when i did this trigger he keeps moving to the middle of the map!!!
thanks in advance!

actually it is small units that arent selectalbe that are moved instantly to follow ur unit around.. then they just shoot automaticly on targets thats get near...

The best thing is to edit barrage or phoenix fire to make them have a custom missile and custom targets, then add the edited ability to the tank.

To make the shokwave make the following trigger:

Event
A unit starts the effect of an abillity
Conditions
Abillity being cast equal to Shockwave
Actions
wait <time the spell will take to finish>
move triggering unit instantly to position of triggering unit ofset by <range off spell> with angle facing of triggering unit

I once made a spell where the hero casts something like shockwave and gets "teleported", I couldn't do it like Kamux's idea cause shockwave missile goes ahead of the target point, I used something different than shockwave for it, better look at final burst spell in this map

genius! barrage or phoenix fire !!! thanks!

kamux, those are the exact triggers i was using, thing is, each time he used the ability, instead of being teleported where i casted it, he would instantly be moved to the middle of the map, :(

vex just dled your map trying it out now, thanks for the replies!

Heyas vex, i just finished checking out your map and damn those are some very amazing abilities. Are those in jass though? i couldnt really understand them, is there anyway to convert those into regular or do those abilities in regular triggers, thanks :)