Your small online business needs all the add-ons that the big guys have, but you do not have hordes of technical staff to make them work. Getting a shopping cart is a case in point. You need to look around to find affordable eCommerce packages that give you all the necessary features and security, to give a professional image to professional customers.
The last thing that you need is to face a load of complicated programming to get your shopping cart up and running, so look for a fully installed shopping cart that is ready for you to add your items and prices - they are around, and you do not have to settle for less. Also make sure your shopping site will be SSL encrypted for security of your customers' data, and that it conforms with the requirements of all the major credit card processors and Paypal.