Advertising

In order to make your product known, you have to advertise it to make people want to buy it. Nowadays, most games are advertised through gaming magazines, like PC Gamer. There are also websites such as Kotaku, which is a gaming blog,  that gives reviews on video games, and puts up screenshots of the games. 
There are also social medias, like Facebook, Twitter, and Tumblr where people can advertise their products.  Now, almost everyone has at least a Facebook or/and twitter account, where they can keep up to date with upcoming games, see what the developers are up to etc. Advertising your product on big social medias like twitter and Facebook is very helpful because like i said before, almost everyone has at least a Facebook, or a Twitter account, so you will know that you could get a lot of people to see your product.
YouTube also has adverts that plays before a video starts, and they are sometimes video game trailers. A lot of people goes on YouTube to watch videos, so another way to advertise products would be to make a YouTube channel and make videos, advertising what you want to sell.