Need help creating a template from an existing pdf form

All the guides are outdated or more likely I'm an idiot; but I can't find where to create the actual template file that I want to ultimately insert into an existing pdf form with the goal of hiding/showing it based on a checkbox selection. Plenty of guidance on the second part, but I'm lost trying to figure out where 'Document Processing' is and other suggested directions to create a template in adobe dc pro? My interface doesn't have these accessible, maybe? Any guidance greatly appreciated!