Be Creatively Kid Friendly: Need re-design of book store website

http://www.abcsbook.com - curent website (horrible looking :>()

Client is an online retailer, mainly of Spanish language texts but also offers different merchandise to Schools, teachers and public shoppers. They are looking for a site that is youth oriented HOWEVER not only focusing on kids because they also have high school and university clients that will be turned off by too much kid design. Please reference their current site at http://www.abcsbook.com.
Their current design turned out horribly wrong and want to start from scratch. The bread and butter of what they do is textbook sales to schools. The home page design is really the most important of all the design pages -- needs to be visually attractive and appeal to teachers who teach all age groups. Important that the interior pages reference the specific product that person is looking for. The far left side bar needs to remain on all pages.
The layout provided is based on the one template I saw and "sort of liked" however as long as all the element are there, please feel free to create something new / different.

The people who call or e-mail them are usually individual teachers and NOT students or parents. 75% of their business comes from within the USA however also get orders from Canada, Europe, Caribbean and Latin America.
How do teachers think? This is how the design needs to be developed.

The site wil be built in Joomla with e-commerce functionality ie. shopping cart. The home page is where your design skills need to shine.
Very important that you provide interior page designs so that the developers can visualize every other page within the site.
I need to see one home page design and two interior page options (this is very simple hence need two to choose from). The far left navigation needs to remain on every page however the images and buttons for the interior pages are completely upto you -- ie. creative freedom.

The sample form on the ppt. frame should look something like this however go by the current site for details of what is required. In other words, people fill this from out to get the online catalog AND follow up customer service. There is no ebook or report sent to anyone. Also, the fields needed are:
first name, e-mail address, phone number, zip code if applicable, country and comments.