How to move to Dortmund? Can you help me? : Dortmund

It could be that most ppl will speak english or your mother tongue with you and it would be come more difficult after a while. I know that my economics degree wont be accepted there but whats options to validate it? I will be glad to hire advices and opinions. Could you give me some advices where to start: Where to search jobs online?. I have some basic knowledge of German but it will probably goes fast with learning when i am there. Thats difficult to say, but to be honest i do not know so much about it.