questions needed answering please

hello i was wondering if someone has actually sold items like digital items, products from companies like amazon and some others so the products don't leave your hand they leave someone else, i have a ebay account very new, and a paypal account setup and want to get setup selling other peoples items and some of my own but mainly passing on other items of interest and digital products reponses are wanted asap as i want to utilize this account and paypal.