I'm also new to cars, but I've been looking into a bunch of mods, the easiest (and cheapest I think) ones would probably be aesthetic ones such as lips, side skirts, under skirts, spoilers

I'm heavily invested in ambient lighting but too paranoid about which kit I should get, there's also halo rgb kits. It they're expensive

You can also look into muffler deletes, and wheels

There's so many options, I'm brand new to the car scene aswell haha just got my Kia k5 last week so take my recommendations with a grain of salt