There are lots of topics that you and your partner could discuss but, of course, the best ones are those included in your interests.

I have just accepted your request as follower on italki, so we can send messages each other. Thank you in advance for your help. However, I wonder why there haven't been any answers to my question so far :<

Unfortunately I can't send you messages. Anyway if you like send me your email to share a great book with you which can be helpful. ;) Good Luck