Edoardo, I would recommend you to read the documentation first, to see if you would really enjoy the language.
Then, make some text management, I mean by: Get string length, Replace a part from string, Invert string...
Learn calculation methods as
PHP Code:
int a = 5;
int b = 5;
int result = a * b; // It means it will multiplicate a per b. Also, use / for division, - for less, + for more...
Learn mod then, also, while, for... Then start foreach.
Make some classes, all static for testing, then really move for OO (Oriented Object).
Good luck. Any help you need, you already have me on skype, so you can feel free to ask.