Sorry I haven't responded, I run out of time very easily, and sometimes the computers I use do not send the messages ><
What may be of significant help to you is information about handles, but handles are a little advanced in terms of learning JASS / vJASS
The first thing I can suggest would be to get the jassnewgenpack, which takes care of alot of problems when you are trying to program using JASS
You can find it on wc3c, just google search jassnewgenpack wc3c and you'll be able to find it.
If you don't feel like getting that just yet, you don't need it yet, when you learn more you are probably going to want it
First you will need to locate the custom script, this is in the trigger editor (open the trigger editor), then click on the little scroll at above all the categories. It should be blue if the map has a .w3x extension in its save. If it is a new map, the scroll might be a tan color. If you still can't find it, it should have the map's save name with the extension.
Once you've selected the custom script, the area where you would normally put GUI functions should be totally empty, and you can type things in there
Before you save your map, I want you type
//JASS Goes here
And nothing else, and then save your map
After you've done this, let me know and we can move forward from there