Today is different from any other day, because I became a member of italki. I'm very excited to see a foreigner left a message for me. And to my surprise, he was very sincere and asked me for some suggestions about studying Chinese.  I think I can help somebody and this makes me very happy.  Now, do you have some suggestions about studying English?  I want to be a interpreter.  Is it possible?  Thank you.

Yes it is possible, but it may take some time.  In the short term, you can become friends with people on italki, and communicate with them on Skype.  You can teach them Chinese and they can help you with English.  This is all for free. 

After some time, if you become very very good at teaching Chinese, then you can consider becoming a "Community Teacher" on italki, and people would pay you money to teach them Chinese.  But to become a good teacher you need to first be familiar with the best ways to teach Chinese to foreigners.  It is a very different process compared to teaching Chinese to Chinese people.  Foreigners need to be taught with very different methods.  Also, I recommend to have good English speaking skills, before becoming a community teacher.

The best place to start is to just become friends with people on italki first - find several "language partners" and you help them with Chinese and they can help you with English :)