Do you already have an idea for your room box? Well then go.....
Sort the shelf parts so that the same symbols are opposite. Then glue together. The hole where the door is hung is at the front right.
If the glue is dry, you can use the intermediate parts on the floor. Remember to use the door between the holes.
Glue the shelf directly on the back wall. You can also wallpaper the back wall beforehand, but then the shelf should be painted beforehand so as not to make it unnecessarily complicated.
Pass or paint the side parts, floor and ceiling before you put them together. If you leave a page open for now, you can lay and decorate more easily.
Finally, only stick the second side part and the front and paint from the outside.
Happy tinkering and decorating!