want to do visa stamping from Germany

My H1b petition was approved and want to do visa stamping from germany first time as I am here for last 2 years in work permit.

  1. Can I do visa stamping from germany?

  2. in 2010, my L1 blanket visa got rejected and biometrics was also taken at that time. will it impact for H1b visa stamping if they asked that did u apply for visa before like that…

  3. I will join different project in US from my current project, so I dont have client letter etc. will it also impact?

Please reply as I am planning to visa stamping within jan 15,2017