First off, Hekate is a Titaness. New Agey people have twisted Her around and named Her a Goddess, which isn't true.
There are reconstructionists. Basically people who do their own thing on their own time. Most of the time Greeky people (like me) call themselves Hellenes, or, more popularly: Hellenic Polytheists. That's the general term, of course, but when you get into the nitty gritty of one's individual specific path, it gets a lot more complicated. Because honestly I don't see another Omni-theistic Eclectic Hellene out there (that's what my "full" title is).
There are mainly books on the path. One I recommend is called Hellenic Polytheism: Household Worship.
But if you're willing to start on the path, I'd be more than happy to help you on your way. :)