not to worry, none of these code are terribly serious, so long as you get them remedied soon. The misfire is likely fairly straightforward, you probably just need a tune-up. I.e. New plugs and wires. If the misfire persists, you might have a bad ignition coil. If so, its best not to cheap out on that, I've gotten cheap aftermarket ignition coils that were bad right out of the box.
The P1325 code is for a fault in the Knock Sensor. This is a very common fault in Subarus, and is usually (as in 98 times out of 100) just a bad sensor, and that's very easy to replace with a socket extension and flex joint on your ratchet.
the cooling fan problem could be nothing, or it could be a failing electric fan, or the control relays for high/low speeds. The code will come about when the ECM commands the fan on, and then doesn't see a corresponding drop in engine temp in a certain amount of time. This could be due to a blockage in airflow across the radiator from leaves or something, or the fans not coming on. If the fans seem to work, and the radiator isn't blocked, it could just have thrown that code because it was a super hot day and you were in traffic and the fan was just pulling the hot air from the car in front of you over the radiator. So basically, fix the other stuff, clear the codes, and see if the cooling fan code comes back.