I would recommend starting with the Guide to Casablanca that has information for an expat in Morocco. As far as marriage requirements:

The length of time to complete the process can vary -- local authorities in Morocco can change the process according to their wishes.

The Marriage Certificate
The Annexe du Ministere des Affaires Etrangeres issues marriage certificates in Morocco. It can take anywhere from a few days up to a few months to get the certificate once the documentation is completed. After the couple wishing to marry has obtained the certificate, a family judge handles the completion of the process.

Congratulations & best of luck!