Thanks for your responses. I've got someone else working on the project now, so I don't need other help.
Wrt the programme needed for DTRPG, you don't have to use InDesign. However I initially designed the document in word, and apparently that tends to result in a bunch of "artefacts" in the PDF generated that create problems in DTRPGs printing process. Basically they've advised me to re-edit it in Indesign