A little bit of previous knowledge in American Sign Language is helpful.  There is a lot of prep to this, in that the signs need to be learned for what you're going to teach, and having a little bit of background info to share with the kids.

-In the US there is the Gallaudet University, in Germany there is German Sign Language and Communication of the Deaf, based at Hamburg University.  Gallaudet runs an exchange program there.

-There are groups that promote the bilingual-bicultural education there, just like in America, as well as deaf only schools.

This website gives you online trasnslations

I generally do Bibbity-Bibbity-Bop words to start.  A big poster with the words on it helps.  z.B. the signs for Waschbaer, Dinosaurier, Elefant, Prinzessin

There really isn't a sign for James Bond, so I improvise and use the Turkish or Austrian sign.

Go through the signs, have the kids repeat them back to you, similarly to if you were teaching the words orally.

For Bop I have the kids flick both hands.  For Bibbity-Bibbity, flick the left hand then the right hand, one at a time.

Days of the week, and other beginning words

A Music Video

And a little background on the signer in the video