This page will give you a variety of resources to studying and creating different kinds of Arabesques and Arabic patterning.
I will try to keep this page organized and up-to-date for you.
This site gives some good resource for beginners wanting to understand Arabic Pattern. They also provide courses both in Abu Dhabi and internationally.
This site has an extensive archive of images of Arabic patterns. It also have some resource for understanding the history and religious views behind Arabic patterns.