Any mistakes?

Because I had never talked with a foreigner, I was worried about living in a country whose language I did not know. However, my brother, who had worked abroad, told me that it was far more important to know a lot about their custom and manners.

Because I had never talked with someone from another country, I felt uneasy to live in a foreign country, but my brother, who had worked overseas, told me that it was much more important to be familiar with the custom and manners of the country I would visit