I have added a brochure provided by the Federal Office for Migration and Refugees (Arabic and English version). See page 50 following to find out about accommodation.
Also added below: Checklist: My first appartment (Arabic language)
Source: Consumer Advice Centre Germany - Informations for migrants and refugees: http://bit.ly/2eLHRnq
If you need more information I advise you the informative collection compiled by the Wefugees community: http://tinyurl.com/ybcprp38
. These informations are mainly in German.