Before starting my request I would like to wish you all a very, very happy 2020 !!!...

a few months ago I started the update of a catalog made 10 years ago... the original where in separate 8 paragraphs and the upgrade was quite important so actually I have to combine 8 files of about 10MB each, give them a new numbering and convert them into PDG for the printer !...
As I am a newbee I would be very interested in receiving some support:
- how to combine those 8 documents ?
- how to renumber the total file ?
- how ro convert the final document in PDF ready for the printer ?

I would like to add that a first attempt to remove the old numbering from the first chapter (20 pages) did NOT work !!! Only a few pagenumbers were removed and I had to remove all the remaining separedly... then when I tried to renumber the chapter only a few pages got their numbers... problems... problems !!! I absolutely need help !
PLEASE ...