Hi Marcos! Congrats, looks great! For oils if you’re just driving everyday and not tracking it. Subaru genuine oil 0w-20 should be just fine. As far as first mods I would recommend coilovers for sure, the car is 10x better with coilovers. Wheels and tires are a preference but definitely help efficency and performance. Must do mod should be headers! Makes the car sound and perform better. Good luck!