Hi @pererumbo,
I am just done with a similar project and do know how to do that first thing you need to do is to upload the images to the 'upload' folder, separate the multiple image files with a ', ' [coma] separater.
You should leave the 'ID' field empty, not required but helpful. and do run your imports the order as being suggested below
1. Import Categories
2. Import Products and
3. Import Combinations
It should work!
Thanks,
Tanveer