Hello Kathy 
Hope you are fine 
Today I was in my Ausländerbohre for Aufenthaltstitel 
They said me to bring 
Valid passport 
photo 
Marriage certificate 
my Ausweis 
Ausweis from my wife 
Monthly Income 
100 euro 
A1 certificate 
Mietvertrag ( Appartement Contract)
And I want to tell you another one thing they have take also our interview my wife was in another room and I’m in another room 
How we meet ,How we sleep, which side sleep in bed , Date of birth, palace of birth ,room colour , Urlaub. Krankheit, tattoo or other things in body like mole or Operation cut etc ,Friends, hobby, partners or siblings , favorite food, drinks., about wedding and gifts , about birthday party and  gift , And same like about  30 different questions you also note that things 
I Wish you best of luck