Finally, I managed to understand a little how WordPress works, and to find a simple theme to use.
I don’t know if I will ever find time to enrich this part of my personal website, but, at least, the blog is set up.
Willing to write it both in Italian and English (btw, I can tell that WordReference is actually great, especially its forum), I tried to look for some plugins and, eventually, I installed the free version of Polylang. After some initial efforts, it seems really clear and practical.