Hello House, I got a txt from them for an interview tomorrow at Elephant house, please who also got the txt. And what does one need to expect.

Hello House, ( @ vicjustice , justwise )
A reputable Engineering company in Germany is inviting me for a training in January next year. They are going to sponsor me with everything including my Insurance, flight ticket and Hotel Accommodation.
I just want the house to advice me on what supporting documents u might have to submit to the German embassy or does it just require me to submit my passport alone. Am really new to visa application and I wld be hurt to be denied or not available for the training that wld last for 3 weeks Next year.
I hope to get replies asap.
Ethan.