But you do know the HP universe (at least somewhat), right? If you do, but are a bit rusty, it's nothing that [url=http://harrypotter.wikia.com/wiki/Main_Page]The Harry Potter Wikia[/url] can't fix. If you don't know the source material I think you're likely to find this more research than it's worth, but I'll probably compile official canon versions of everything that's likely to turn up in the Episodes (or at the very least link to relevant HP Wikia pages), and so you'd only really need to pro-actively know what you're doing for passing details, which are less important.

[i]Edit:[/i] Ninja'd. Deferring to the wiki is definitely A+++