Hello Issa,
the counselling services of the Information Centre for Voluntary Return (ZIRF, means in German "Zentralstelle für Informationsvermittlung zur Rückkehrförderung") provides very extensive informations for refugees interested in returning. Their information is hosted on the website of the Federal Office for Migration and Refugees, go to ****://tinyurl.***/gmrk3xj (English version).
The ZIRF offers a special information flyer, the versions in Arabic, German and English are attached below.
Kind regards, Jan