NOTE: This site (pixelprospector.com) is not endorsed by Epic Games in any way, I am simply including as helpful advice, since I’ve seen this topic mentioned a few times.
Here is a useful infographicfor indie game developers wondering how to get started marketing their product. It has a very clear breakdown of how you should approach marketing your games, and a lot of relevant questions you should ask yourself. It also has an extensive library of linked articles from other resources discussing indie game marketing. I hope this helps someone!