This can be easiest done through the "mission mod tool"
http://www.swbfgamers.com/index.php?action=downloads;sa=view;down=319
It is a subset of the full mod tools.
Change the text in the LUA, munge, replace the mission.lvl file.
It gets more complicated from there if you want to use units that are not already loaded. But that will get you started.
This guide will also help
http://www.swbfgamers.com/index.php?topic=8.0
http://www.swbfgamers.com/index.php?action=downloads;sa=view;down=319
It is a subset of the full mod tools.
Change the text in the LUA, munge, replace the mission.lvl file.
It gets more complicated from there if you want to use units that are not already loaded. But that will get you started.
This guide will also help
http://www.swbfgamers.com/index.php?topic=8.0