I landed on a page today that has a great list of sites to advertise your books. so when you are up and running and ready to sell you might want to check it out :https://jamescalbraith.com/2013/01/09/80-sites-to-advertise-your-book/
This site has a pretty comprehensive list of sites to post on and discusses ways to gain an email list out of giveaways that you put out. Don't just give your books away hoping that you are going to gain extra sales through just those leads: Look, you need to start thinking about the big picture: How do I reach as many of my targeted audiences as possible? Building an email list for future books is one of them...
Do you have more ideas to share with me? I would love to hear some success stories! Have a great day, and keep writing! ~LuAnne