You're a game designer now.
No, really, you are. You're not getting paid and, in fact, you had to pay us but still that's your job. Welcome to it.
See, what we did was we designed a lot of a game, like all the pieces you'd usually use if you play it the way we do, but really, realistically, you're not going to do that. You're going to play it the way you want to play it which will, because you are awesome, involve coming up with stuff we never could have dreamed of.
So we didn't bother to design every goddamn thing that could ever possibly happen in this game. If we did, we'd have only two options:
A) Simplify the game. Which would suck because the whole point of choosing this kind of game over a board game or video game is that everything matters that you can make matter and there's all these little nooks and crannies of weirdness you can put together out of the pieces we give you. I mean, video games are cool and we play them too here at the office on lunch breaks, but we do this too because sometimes you want fried chicken instead of a burger, right?
B) Write rules covering every possible situation ever. Which would suck because you'd have to either memorize a really long and (therefore) expensive rulebook or else look things up all the time. Or ignore the rules and then get static about not following rules that we only put in there in the first place so there'd be a rule not because we thought they added way more fun than just making something up that you--being awesome--know fits the way your group wants to have fun with these tools.
So yeah, we gave you an incomplete game and you have to finish it. If you think that sucks, we will give you your money back and you can play some other game for people like you, if instead that incompleteness reminds you of the Pandora's Box of potential we trust is in your introduction-reading noggin, then you are our kind of people and I think we will be happy together.
Now, hey, we're a business, and from time time we will try to sell you crap. This crap will essentially be suggestions about some more rules to add to the total corpus of rules (these rules plus your rules you made up) and, as with all suggestions, you either trust us or don't. Feel free to not trust us--we have never met your players and don't know you. This is like we sent you a suit in the mail without your measurements, maybe it fits, maybe it needs to be let out a little. We don't know--and if we did that'd be creepy.
So this is a warning: if you've got no tailor in you, play something else.
Now, it's always possible our company will be bought out by assholes (we might let them, game design doesn't pay so well), and they--in order to make money--will pretend these suggestions they're selling aren't suggestions and aren't just the best they could do without knowing you, but instead actual supergenius instructions from supergenius game-designing brains capable of accounting for all humans ever. Remember these people are wrong. You're still stuck being a game designer, and collaborating with us to have fun at your table with your pals.