I'm often asked about which broker is best to 'DEMO' on when first learning forex. Here's the thing: demo will not prepare you for live trading. You'll still be learning when you go live. However, it's important you know the basics and even more so that you know how to operate any given...
If you're in Italy, I highly recommend Pepperstone .. They have great customer service, and their execution quality is top notch.
A broker is very important to trade in forex and your broker provides you an opportunity to invest in account and trade through your broker. Always choose a broker with a good reputation and the broker should be reliably trusted.