Hi Jim, welcome to the forum!
You can to the right place if you are unsure if they work, because with a bit more info about yourself, you can qualify for a free 25 dollar gift certificate in which you can grab to small bottles to try them out and see for yourself.
As for the varieties, there are tooooo many. A good place to start out is in the Introductions forum, and at the top is a list of “stickied” threads, which have an abundance of information about the different molecules and what they do.
Can you tell us a bit more about yourself? Specifically, what you hope to achieve with pheromones. Romance? Climbing the career chain? Or just an improved social life? Giving us some info like this helps us help you make a more informed decision and make your gift certificate go to what you are interested most in. Awaiting your reply, and again, welcome!