Hi,
There was recently a spice trade conference in Tucson, AZ. I would suggest joining whatever professional organization that may be for whatever information they may offer and networking opportunities.
The Spice House's product line is something like 400 different spices and combinations. The Spice House has a competitor in the family with Patty's brother the founder of Penzey's that has maybe 50 stores nationwide. Spice House is at least second and possibly third generation of ownership.
Nielsen-Massey who make vanilla and several other flavorings have less than a dozen products. Nielsen-Massey is maybe on its fourth generation of ownership.
You could go business to business in essential oils, fragrances and spices. There is a company named FONA, which offers classes to the industry on flavors. You might want to get your feet wet there.
Personally, if I was looking to invest money and knew nothing about spices et al, I'm not sure it is the first place I would put my money into.
Regards,