Almost out of High School here in Italy, and about to go to University
In the meanwhile I'd want to gain some money using my programming skills... How should I start?

First things first you need to create a portfolio.
Or, do what I do... Teach people how to code for a fee per session.

Paid intern, develop an app, create a simple web site...

I'm not entirely sure what the education system is like over in Italy but here in the UK coding and more importantly developing is becoming mandatory as part of the IT syllabus.

So, If it's the same over in Italy it's a prime opportunity.

If you're a web dev without a ton of experience, probably customising Wordpress themes for blogs and brochure websites for small businesses.

If only to learn why you shouldn't use Wordpress.

Shut up sublime, i won't purchase u, no chance mate!