Begin by logging onto onto the Salim Speak 7 Learn Arabic website. This should be your first stop when trying to learn Arabic online. The website offers dozens of lessons, starting off with the Arabic alphabet and several other vocabulary lists. There are also numerous audio lessons, something which is very important when learning any new language (see Resources below).
Go to the Babel: Arabic website. The lessons found here are slightly more structured than what are found on the Speak 7 site. You can choose to start at the very beginning, where you will learn basic Arabic communication. Babel also allows you to skip ahead to more advanced lessons, which teach you how to write in Arabic (see Resources below).
Visit the Search Truth Arabic lessons website. Search Truth gives very lengthy and detailed explanations during each lesson. The website also offers a large list of commonly used phrases. Most importantly, you will find numerous audio lessons on the site (see Resources below).
Use the Marhaba Lesson Plans to learn Arabic phrases you will use in everyday life. Everything from greetings to everyday conversation can be found here. You can even read fascinating history lessons (see Resources below).