To reinforce what Doug has said, while you can drag and drop text in Word, you cannot position it exactly as you can pieces of text (treated as art) in a page layout application. What you can do in Word to put text on the lines of your legal pad background
is to experiment until you find the line spacing that spaces text evenly between the lines and then set the top margin (or Spacing Before) so that the first line of text is sitting on the first line of the background. This requires a little trial and error
but is the most satisfactory solution, at least for small quantities of uniform text. If you need to add Headings that will have a different font size, line spacing, and Spacing Before/After setting, then it will be much more difficult.