I just installed ZenCart on my website (http://www.navpublishing.com) and I've figured out the override system (I think). Now, I'm trying to make a template that looks similar to the rest of my site. This would include the large yellow top-left header/navigation bar on all pages of my store (this would be the first step in making ZenCart consistent with the look and feel of my site.)

I'm just not at all sure how to go about doing this. I've been reading the documentation, but I still don't have a clue on how to change the layout (or anything else, except for the strings.)

Anyone's help would be greatly appreciated.