Once you have those basics down, you can go to town customizing your shop with built-in modules (like adding discounts and specials) or modules from the community add-ons for tweaks like adding subcategories, a FAQ desk, random products boxes, and more. Installing the third-party add-ons usually only involves editing a few lines of the configuration files and then uploading them to the shop folder, but it’s always a good idea to back up your shop before doing so, as these are install-at-your-own-risk options.
To modify how the osCommerce site looks, edit the stylesheet.css file in your main folder (here’s some basic CSS info to get you started); you’ll be able to change the color of your box headers and more in that CSS file. You can also replace the default gif images in the images/infobox folder.
The other files you should check for configuring the look of your shop are the header.php, footer.php, left_column.php, and right_column.php files found in the includes folder. See the osCommerce documentation for further details and this forum thread for tips and tricks.In part the first of our Night School series on how to make a web site, we learned a little about…
Otherwise, you can download new free templates and themes for your store or buy one from someplace like Template Monster, but be aware that changing the theme may (or may not) override any customizations you did before. Hiring a professional designer to help you with your online store is also a good idea if you have a lot vested in it