Since Paul sold it as a WSO, I would assume he either created the course or he paid someone to create it for him. It's a totally legit business model to get a whole bunch of PLR created for you and to sell or do a launch for that.

This is different from simply buying PLR, giving it a facelift, and selling it under your name. Not saying this isn't legit, of course. You'll have a hard(er) time finding JVs for this option, but with the first option (creating your own PLR package or outsourcing it, and then selling it), you'll have an easier time, depending on quality, pricing, and so on.

I think it would be a lot easier to create your own PLR instead of trying to find good PLR (unless you've already found a source of good PLR). I mean, with other PLR, you'd revise the content, the graphics, and the copy anyway - why not skip the revision process and just create your own?

This way, you can get a good OTO created to go along with the front-end. After all, if you want JVs, you'll probably want a good sales funnel to attract them. It's easier to create a complementary upsell product when you're intimately familiar with the front-end (because you created/designed it).

Again, internal launches would work great in this situation. Get a list, get a reputation for releasing solid PLR in a certain niche (or multiple niches), and keep cranking it out. Limit each to a low number (50's good) and you'll be virtually guaranteed to sell out quick each time.