Translation of minderjährig

Let me explain: A company that has may difficulties needs to change its behavior, its organization, its business plan and sometimes the entire management. In this case, change must happen anyway.
How could I get better in Spanish if I had to eat by myself. Impossible. The next days we always ate together and sat around the table for hours discussing politics and the lives we were living.
I got a nickname. Please answer the questions from my previous email (below), except number 4, which is answered on the Vocabulix's faq page. I am ready to start tomorrow, but i need the info first.