The idea is to condition your users. Don’t push towards selling only your products, make it a point to create comfortability with users thus allowing a relationship to form. Make contents that are relevant, timely, and tends to help users. Or engage in creating games or mini games so your site or page could be deemed as not only informative but also engaging in a good way.
If you're wondering what a sales funnel is, simply imagine a real-world funnel. At the top of that funnel, some substance is poured in, which filters down towards one finite destination. In sales, something similar occurs. At the top, lots of visitors arrive who may enter your funnel. However, unlike the real-world funnel, not all who enter the sales funnel will reemerge out from the other end.