Good luck assembling, you’ll love PC gaming I’m sure!
Just in case you don’t know already: https://pcpartpicker.com/ is an amazing site to plan a build. You can put all the parts you’re aiming to buy and it’ll tell you if there are any compatibility issues. You can share your parts list with a community too and ask for specific advice.
Concerning parts, XFX AMD GPUs are very well built and go for a reasonable price. Their 6000 series have great cost/performance value imho. I have a 6750XT in a PC connected to a 55’ TV and it’s hardly breaking sweat provided I don’t go overboard with game settings. For a normal computer screen you could have plenty of fun out of a 6650 XT I’m sure.
Could you get Amazon delivery from say, amazon.it? It could give you a chance to find what you’re looking for.