If you have multiple eBooks to sell then setting up your own website / blog would be a good idea. You can even setup a WordPress and WooCommerce website to sell them from your site directly and is an easy way to start.
You can put up information about the eBooks and what they cover and even a review if you want. This will give people some information about the eBooks and they will possibly buy from you.
After you have a website for people to go and get more information about your eBooks and possibly make some purchases you can then start marketing them. The social media websites like Twitter, Facebook, Google+ and the rest would be a good place to start marketing your eBooks.
You can also sell them on Amazon, eBay and places like that but selling on your own site has advantages over those types of sites. Having your own website where you sell your eBooks also presents a more professional image and helps to present a more legitimate image.
I would always choose having my own site and doing marketing for my eBooks.
