Hi Cathrine, congrats to your new king!
I'm not quite sure I understand what you are asking about. I don't know how you will be organising your site, bilingual on every page, or separate English and Danish versions, each in its own folder, or pages in both languages together with just the file names separating them. So let me tell you how I have done it on this site:
https://kandoraservice.de with three languages:
1. I have all the HTML files (well, PHP files actually) in one folder, the English files start with 'en-', the German ones with 'de-' and the Norwegian files with 'no-'.
2. There is only one index file (in German because the site owner is German), so the file name is just 'index'.
3. On the index page I have placed the language switchers, the kind of large-ish icons at the top right. Selecting a language takes you to the About page in that language.
4. From the About page onwards and on every other page there is a navigation menu. This menu has been saved as a 'symbol', a separate one for each language.
5. In order to select another language, you need to go back to the index page.
I don't know if this is helpful or not. If I have misunderstood your questions, you need to explain further.