Do you like the idea of driving a sports car more, or building it piece by piece?
It really depends on how much time you want to put into it. If you're looking for something to assemble but don't want to go crazy, pre-painted kits are the smartest choice for beginners - they come already colored and you just glue them together, which means less frustration and more satisfaction when you're done. Brands like Bburago or similar have pretty decent 1:43 models at affordable prices, maybe around 10-20 euros for a standard piece. If you want classic Ferraris or Lamborghinis, you can find them too if you hunt around a bit, but nothing impossible.
If instead you want to do the more "constructive" thing with actual assembly kits (soldering, painting, the whole deal), then we're talking about a different level of complexity and investment. Full kits with detailed instructions cost more - maybe 30-50 euros and up - and you'll need basic tools: a hobby knife, specific glue, maybe a paint stick. But for starting out I wouldn't throw myself directly into complicated kits. I'd start with two or three pre-assembled models just to figure out if it's actually something you like, and then maybe ramp up the difficulty level later.
Generally speaking, to get going "properly" without overdoing it, I'd suggest putting down maybe 50-80 euros total: a few models (even if they're simple ones), the right glue, and a couple of basic tools. You'll see right away if it's something that gets you hooked or if it's just passing curiosity.