It is quite easy when you read about the structure of KMZ here:
KMZ Files[
^]. You won't be needing any supporting files if your original KML file does not reference external files:
Here an excerpt from the site above I linked to:
- Create a folder that will contain the contents of your KMZ file. Give it a descriptive name (for example, buffetthawaiitour).
- Put the default KML file (doc.kml, or whatever name you want to give it) at the top level within this folder. Include only one .kml file. (When Google Earth opens a KMZ file, it scans the file, looking for the first .kml file in this list. It ignores all subsequent .kml files, if any, in the archive. If the archive contains multiple .kml files, you cannot be sure which one will be found first, so you need to include only one.)
- Include one or more subfolders within the main folder to collect images, models, textures, sound files, or other resources referenced in the doc.kml file. The complexity of this directory structure depends on the number of supporting files and your preferences for organization.
- Use relative references. See References to External Files for more details. All relative paths begin inside the base folder described above in item 1. For example, if a KMZ file vacationJournal.kmz is on the desktop, and its doc.kml file refers to a file myFavoritePlace.jpg, which is also on the desktop, the href in the doc.kml file is ../myFavoritePlace.jpg.
- Do not use the .kmz extension for any of the subfolders within a KMZ file. The .kmz extension is reserved for the name of the archive itself.
Regards,
Manfred