What is preselling? According to DoshDosh.com, it is, "the art of conditioning potential customers and making them more likely to buy products/services".

Preselling products/services on your website is a way of writing content on your website so you become a trustworthy source on the topic of interest and therefore your customers will be more likely to purchase a product from you. Basically, you need to set yourself out as the expert in the field that you are trying to sell your products in; which will therefore make your customers feel more comfortable purchasing those products through your website.

So, if you're recommending people purchase games from PrintableGamesAtoZ.com, tell your customers why. For instance, our printable games are fantastic for last minute party planners who don't have time to go to the store or wait for games to ship to them. Also, purchasing a printable game online is less time consuming than creating and designing out your own. Why do it yourself, when we can do it for you for a great low price?

There are several great articles online about Preselling. I'd advise doing a Google search to find the articles that make the most sense to you.