Welcome to the forum. For advise and tips go here:
After going through and reading the above 4 links, check out the review section for some valuable info on what members say of hookah products and brands etc. If you have any more questions after that, don't hesitate to ask...
Oh, and in all honesty, if you're not gonna smoke tobacco, then I really don't think you should buy a hookah in the frst place. I'm not trying to tell you what to do, it's just that, not smoking tobacco kind of defies the point. Not only that, but you will never get the same taste, smoke quality, or enjoyment from somking that fake herbal crap. To put it in perspective, comparing the herbal crap to real shisha: is like comparing a nasty hamburger served at your fifth grade cafeteria, compared to a Filet Mignon prepared at an expensive restaurant. Sure they're both meat, but they taste completly different...