So I have been DMing a little while now

i I feel I can create a good campaign / one shot.

so good I would like to print the adventures out in a professional looking format (as if produced as an official book.

i was wondering if there were any programs out there that would allow me to do this.

Depends what the company printing the book needs.

So, standard layout programs you could try to use are LaTeX, Adobe InDesign and similar stuff... maybe there is open source programs that do the same.

I guess most companies can already use pdf files for printing and do not need specific formats nowadays.

However, you need to do layouts that consider the binding of the book, if it should look really professional.

I have used Homebrewery in my projects. It creates PDF files.

Frostglade Tundra: https://homebrewery.naturalcrit.com/share/SyZ_4eEyKE