PDFs might be your sticking point. I’ve not found any software that will handle all the different things you can do with acrobat in an easy way. But I have to heavily modify PDFs from time to time, and you may not have nearly the needs I do.
I’d suggest checking out libre office, and see if you can find a PDF application that satisfies you. The app store on pop os is really good, as is the interface, and if you don’t like tiling window managers, you can turn it off.
Another suggestion is to recognize you’re a novice. If you read something that sounds like a perfect setup, but it’s a little complicated, put it off. You don’t want to get in over your head, because linux distros will not keep you from breaking things. The defaults of any large distribution are a pretty safe bet.