bootcamp – I have a problem on Windows on Mac via Boot Camp

I've tried to install Windows on Mac via Boot Camp, I emptied the space required for the installation of Microsoft and the installation was a success (for as far as I know), but the problem is that I do not know what to do next. When I open the Boot Camp Assistant again and try to press "Continue", an alert dialog will appear (I have captured it).

An alert dialogue

The storage on my mother also confuses me a little now, it indicates that there is an OSXRESERVED file, which took the place, but the "drive" of Boot Camp (I'm not sure that's the word correct) is empty.
I just do not understand where I can access Microsoft or where the Microsoft iso file mount should take place.
Here's a screenshot of the Mac Storage:

Storage room