For this tutorial, you will need a version of Photoshop. I am using CS6.
Open a new image, select your font (chunky fonts work best), change the font color to white, and type out your wording.
Play around with the settings and color until you are happy with how your font looks.
Save once you are done :)
(If you want to do two colors like mine, before you add any glow, duplicate your text layer. Do one color on one layer and one on another. Use the Erase tool to remove one word in one of the colors and that word will appear in the other color (ONLY DO THIS ON ONE LAYER PER WORD!)