After you load MIST via trigger, play sound to a country such as Australia and use that beacon.ogg.
What you can do to help learn, is go through the MIST lua and get used to the language in it. Read the MIST manual. And, in my opinion, dissect other missions and learn by studying how they did things. Please, if you modify someones hard work, give them credit. Good luck and let us know how you are doing and post your miz file so we can look at it.