Hi Corrado. You write very well in English. Here are a few grammatical changes you can make.

Hy Hi guys.
It's my first time in Italki and I'm searching looking to learn the English language and the this website too. [Here "looking" indicates your goal or intent. You could also use the word "trying" or "hoping". All of these can be followed by another verb. Ex. "looking to learn" or "trying to practice". The verb "searching" is usually followed by the thing/noun you are searching for. Ex. "searching FOR a book " or "searching FOR a way. "Searching" is not usually followed by another verb.]

Actually, I'm watching the scores of football clubs because this morning I made/placed a bet. I love football and all sports. and I like to meet new friends that who love football too, for so I can improve my English and for teach Italian. [When using a clause (or short phrase with a verb) to describe a thing, we use the word "that". Ex. "A team THAT wins often". When using a clause to describe people, we use the word "who". Ex. "New friends WHO love football".]

Keep up the good work!