How to use attachments?

what kind of event(sorry have never done this bevore)

For a simple one, try:
Event - Time Elapsed
Elapsed Time is 1 second

So its just one second delay then your special effects action activates.

Do Map Intilization for the event

Attaching weapons

What type of event im stumped aswell?

Just put Map Initialization as the event and the unit will have the weapon attached once the map starts. Or the event could be when the unit is made, or when the unit picks up a certain item, etc.