If you specified the assets stuff in the config file, the directories should already be there (and possibly skeleton files).
They would be at:
assets/mycomponents/whatever/assets/components/whatever/css/
assets/mycomponents/whatever/assets/components/whatever/js/
assets/mycomponents/whatever/assets/components/whatever/images/
On installation, they will automatically go to
assets/components/whatever/css/
assets/components/whatever/js/
assets/components/whatever/images/
The more generic answer is that everything in this directory:
assets/mycomponents/whatever/assets/
will get transferred on install to
and everything in
assets/mycomponents/whatever/core/
will get transferred on install to