I suggest you take a look at the Master Template system ( http://www.archicadtemplate.com/
). This is a very complete template system that will work for a large firm or a one man shop. In the small firm I work for we found that the time is saved us in setting up a template was well worth it's cost. The system also includes a few library parts and materials.
As for a folder structure, you can find a few out on the web if you poke around enough (try here - http://www.digitalvis.com/archicadtips
). However, you will probably be better served setting up a folder structure that makes sense to you and the way you work.
edit: just noticed you are in Denmark. You should talk with the Master Template folks first to make sure their system will actually work for you. I believe they have an international version now but am not sure how that will fit with your localization.
AC 19 6006 & AC 20
Mac OS 10.11.5
15" Retina MacBook Pro 2.6
27" iMac Retina 5K