What you will need :

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Taken from PCGamer Magazine

An idea for the skin that you want Skin edit to make your custom skinOpen Skin Edit. You’ll see a blank template and a preview of your character in-game on the bottom right screen.Start drawing and filling in the blanks. Don’t worry too much about making it perfect the first time. You can see in real time what your character will look like in that preview in the bottom right. Click on it to make the model stop running or turn it with your mouse to see how your character looks like from another angle.Once you are satisfied with your work, save the image anywhere on your computer. Navigate to the Minecraft Preferences page in your browser and upload the file of your new skin that you just saved onto your computer.