HELP ME WITH RE-TARGETING CUSTOMERS WHO VISIT MY WEBSITE

I need help with establishing a re-targeting campaign for my Website. Currently i host a webinar - and at the end of the webinar I announce the website that the listeners need navigate to in order to purchase the product. Today I had 90 visitors after the webinar and 33 purchased. I would like to re-target with an AD to those visitors who visited the webpage but did not make the purchase.--You know the type of ads that follow them around when they surf the internet AFTER going to my webpage [login to view URL] I WOULD LIKE HELP PLACING SEVERAL DIFFERENT RE-TARGETING CAMPAIGNS : BUT THE PRIMARY IS: Those that Visit my website but do not purchase Can re-targeting be done without facebook? See those ads from "AD-CHOICE" and other companies. I need your recommendation on the best company to do with this as well as how pricing works and what sizes of Ads i can run. NO GENERIC COPY AND PASTE BIDS AS THEY WILL BE IGNORED.