This tutorial is an extension of the tutorial on creating Multiple Selection Checkboxes. This tutorial will add a little snippet to one of the functions in that tutorial to show you how to add a section heading to your group of checkboxes.
The end result is to have a heading for the group of checkboxes, followed by the checkboxes with the label text to the right, much like this screenshot.
This is a slightly more advanced tutorial that the previous basic tutorial. You might try that one first.
While not overly complicated, I will work through the process step-by-step so that it is easier to understand what each section does.