Hi Ahmad,
You could look at courses on the Mt. Orange School site (http://school.demo.moodle.net/), or the Moodle QA Testing Site (https://qa.moodle.net/) to get an idea of how to do things in Moodle. You can also download and install courses from the Moodle hub at https://moodle.net/ and install them to see how things are done. Last time I checked there are around 75 courses there for downloading.