How can I start my car without the immobilizer chip in my new key

That is part of the security system we cannot give out information on how to bypass security systems that information can fall into the wrong hands. The German cars have a pretty good security system though. You are best bet would be to try to call different lock Smith's and see if you can find one that can make you a key and program it. Otherwise the dealer or a independent shop that has the technology to do that kind of thing.