Your website doesn't have to be elaborate, expensive or fancy, but it does needs to exist to show people you are in business and serious about it.  Don’t spend a fortune; instead have your business logo, name and address, basic contact information, business picture and a description of what you do.  Have an image folder with a picture that matches the catalogue number that you want displayed and your POS Software can take over and do the rest.  Your products are arranged by the department/class structure you have set up.  The hardest part is the thought process in setting up your POS Software to align it with your web.