This tutorial is made up of three parts—the background, the text itself, and some final extra effects. So first of all we're going to make a background. To do this we create a new document in Photoshop. I made mine 1920 x 1200 because I want this image to sit on my laptop background.
We start by drawing a Radial Gradient with the Gradient Tool (G) going from a light yellow-green (#adbf41) to a mid-range green (#328a26). I wonder if I've ever written a tutorial that doesn't start with a radial gradient. :-)