@Panic I am sorry I never addressed your question. You are correct. As long as you know about the Last of Us world, you don't have to know a damned thing about the actual game. Knowing about the game may help with immersion to a degree, and I suggest trying to view some clips if you are ok with spoilers, but no, you don't have to know anything about the actual game characters or anything.
Again, the OOC is up. I have no definitive start date. Please read the OOC and feel free to ask me any questions in the OOC, or via PM.