If you go through everything on:
It should give you more than enough knowledge to de what you want to accomplish..
I agree with what has been said before, you are best of learning some html, php and sql, and then making the changes yourself. Even with just a little bit of knowledge you can already start making big changes, plus you might find it very enjoyable. Look at that link I gave you, go through all the tutorials, and it shouldnt be a problem at all. And if you do get stuck with a specific problem, you can always ask here..