Is this the correct PDF export layout for stitched binding?


I am currently waiting for a reply from my printer, but I want to ask about the general practices:
For staple stitching, do the printers generally ask 2 different PDFs for cover and for content?
Should I define 2 separate start sections at the pages for both documents?
If my paper is only 80 GSM, how many pages can I have at maximum staple stitched so that the magazine will be perfectly closing, no gap in between?
If I choose a much thicker paper for cover, will it look bad or not closing properly?
I don't want cover pages that do not close and they get lifted by themselves, or magazines that don't properly close and they have a gap close to the stiches on the inside.
I will only start out with 52 pages perhaps, so how should I number the pages in each PDF, if the cover PDF would be separate from the content PDF?
