Here is a few Photoshop tutorial roundups for beginner that useful for improving your design skills, you will learn how to create your very own icon in step by step with file source available for download.
For this tutorial, I wanted to do an icon with a 3″ diameter and itty bitty scallops. So I decided to make the scallops ~ .125″ (ie they extend .125″ away from the icon edge). This meant I needed 1 circle with a 3″ diameter and dozens of small circles with a .25″ diameter (a .125″ radius).
6. Create a Pixel-Perfect Social Icon Using Vectors
Learn how to create a simple share button in Adobe Photoshop! This is a pretty simple tutorial that will teach you how to create pixel perfect vector shapes and how to easily handle the vector tools in Photoshop.