Congrats! Sounds like a great F to pick up, especially considering the year and with such low mileage. I've had several "B" level cars in the past too like the STi/Evo and, while the F isn't as supported by the aftermarket, I think that's partly due to the fact that it really doesn't need as much. It's a pretty well sorted car from the factory, and this is coming from someone who has modded every car I've ever owned.
It's just nice being in lap of luxury and having that power at your fingertips. Car is dynamically quite capable as well. As far as mods or must buys go, IMO some sort of intake, header, and exhaust is a must to really open up the motor and hear that V8 roar. Otherwise you have a really new car so might as well just enjoy it as is, it'll feel great stock. Congrats again
I just bought mine too so I know how much fun you're about to have!