Help with HTTP Headers

Hello, retired long time programmer, first time poster. I am just learning Web development due to being asked to support a local League Website. It is a private site tha basically serves up PDFs of the weekly results. It is hosted by GoDaddy. My issue is with the PDFs being cached. I understand the problem and it looks like the best way to fix the issue is with HTTP Headers as follows:
(Preferred method)
Cache-Control: no-cache, no-store, must-revalidate
Pragma: no-cache
Expires: 0
(other option)
meta http-equiv=“cache-control” content=“no-cache”
meta http-equiv=“expires” content=“-1”
meta http-equiv=“pragma” content=“no-cache”
My problem is that I have no clue where to add the “preferred” option. If I use the "other’ option, do I need to add the meta code the the Header of each page that opens a PDF or just in the Header section of the index.html?