I think you have the general idea? There's not much "gameplay", you click to advance the story and occasionally make choices. Unfortunately, it seems that Fuwanovel lacks a decent newbie primer, so here is a decent primer made by some 4chan anons: http://visual-novels-general.wikia.com/wiki/Basic_FAQ
As for where to get them, you can buy officially translated (or sometimes natively english) VNs from MangaGamer, JAST, and Steam. There are also a lot of fan translated VNs that come in the form of patches to the full Japanese versions, but it is unfortunately pretty impractical for westerners to obtain them legally, and Fuwanovel does not allow illegal links to them, you'll have to find them on your own.
A good resource for VN fans is VNDB, which has information on every VN ever made (or, it tries to). Listing the VNs by popularity is a good way to see what's popular at a glance, and when I got into VNs I spent a lot of time browsing that and checking out whatever piqued my interest.
edit: And since this post has been spun-off and moved, welcome to the forums!