Need some info on quest triggering

Greets. I'm kind of a noob at making triggers (obviously).

Anyways, I would like to learn more about quest triggering. Which actions to use and so forth. I wish to use the big yellow exclamtion mark to signal that that unit has a quest available. Does that activate on its own once a quest is created through the action? Or do I have to trigger in the yellow "!" myself?

Do I do something like this?
[trig1 (quest start)]
event:
- unit comes with in 200 of "quest giving unit"...etc
action:
- multiple cinimatic actions (ie. cinema mode and text, explaining what to do +story or whatever)
- create required (undiscovered) quest named ....blah blah blah
- Mark quest as incomplete
[trig2 (quest end)]
event:
-unit dies
action:
- cinema or something actiosn if i want (return to quest giver for reward)
- mark quest as complete
[trig3 (quest reward)]
event:
- unit comes with in 200 of quest giver
action:
- cinema or text action
- hero - create [item] for [triggering unit]
- destroy quest

Am I missing anything? Would I need to create another trigger before that first one for the yellow "!"? Any trigger examples would be of help along with any comments or anything.

Just add the action:

Special Effect - Create a special effect attached to the overhead of [Quest Unit here] using Abilities\Spells\Other\TalkToMe\TalkToMe.mdl

whenever you want a unit to have the yellow exclamation mark over its head, for example when the unit comes within range. It's also good to add a Special Effect variable and name it something like "Exclamation" via the variable editor and add the action:

Set Exclamation = (Last created special effect)

When you want to remove the exclamation mark use the action:

Special Effect - Destroy Exclamation (The special effect variable)

Hope that helps you, otherwise feel free to ask more.

Yup, thanks. Just what I was looking for.