Thank you. This helped point me in the right direction.
All the above mentions, by WPyogi are good. If you have no foundations of HTML and CSS, it is probably wise to learn them separately, then think about how they apply to WordPress.
Good Free Resources:
http://www.w3schools.com/
http://www.codecademy.com/
If you have the time and money to invest:
http://www.lynda.com
http://www.learnable.com
I get you now. Thanks for your help.
BTW, so are you saying the code I entered first would return the URI for the images directory outside of the theme? Or what? In other words, if I was to use the code I used above, what directory would my image have to be in, in order for it to work?