adding live product feed to website

Hello. I have recently opened an online adult store. I get the majority of my products from one supplier. I have added them in manually on dreamweaver but due to stock being out of stock etc i am going to upgrade and install a live product feed. This way when they add products and take them off etc it links onto my site. as soon as they are sold out then its sold out on mine etc. I have no idea how to install this and need someone with experience to do it for me. I have the url which links to the excel file.