The following tutorials outline the arabic letters. It is best to print and trace over the letters to get familiar with the writing style.
For best results, Arabic Calligraphy should be written using special calligraphy pens. The preference is always to use a Reed pen made of natural material giving the flexibility to manoeuvre. A second, less costly option, is a using a Pigment ink pen, such as the Yoken Calligraphy Pen 3.0 (widely available online).