Recommend the best performance upgrades and accessories for a Jaguar XKR.

So I just picked up this 2011 Jaguar XKR and I honestly have no idea what I'm doing. It's the most expensive thing I've ever owned and I'm kind of terrified of breaking it but I also want it to sound a bit meaner and maybe go faster? I keep seeing people talk about pulleys and remaps on other sites but I dont really understand what any of that actually does to the car. I'm in Orlando so it's super hot here all the time and I'm worried about the engine overheating if I mess with it too much. My budget is like 3000 dollars right now and I'm hoping to get some stuff done before a big car meet next month. Is there like a starter kit or something for people who aren't mechanics? I just want it to feel a bit more special when I take it out on the weekends. Are there any accessories that make the interior look less like an old mans car too? Sorry if these are really basic questions I just really dont want to ruin the engine by buying the wrong parts from some random website. What are the best first steps for someone who has literally zero experience with car mods but wants their XKR to be a bit more beastly?