Welcome Japes, and the best of success to you!
A good listing of niche frags can be found at such websites as http://www.luckyscent.com, www.lusciouscargo.com, http://www.lacremebeauty.com (my favorite), and http://beautyhabit.com/perfume.html. As far as distributors go, you might try the www.[nameofmanufacturer].com. I've never gone into business myself except to contract out in a totally different direction than scents. There are others here (Cedric???? where are you???), Tigrushka, LadyLonestar, Artisankey, and many others - who can also help you with the "niches".
Good luck - we're glad you're here.