can we becom language partner just tell me if you are interessted to talk for improuve level and skills 

Hi, Chiara.
In my opinion to find a good language partner is a very difficult thing. There are some reasons for it. First, you have different levels in knowing of languages. Second, you have different interests. Third, you have different goals. Unfortunatelly, I often met people, who didn't really want learning, but only having fun.
As for how to know exactly - is it your type of partner or no - just try it. Send him or her a message and hope for the best:)
Regards,
Sergey.

THe idea is to just add people and ask them if they want to be a language partner, some prefer skype or just chat. And, the best things to talk about? i don't know, it depends, usually is better to take it as a normal conversation. When you met someone you can ask about the culture, why are they learning a language, the things they do/like ,etc. Just a normal conversation but, in another language of course, you don't have to think that much.

Hope it helps!