I manufacture rubber stamps and also silicone baking molds but I am an internet business and not brick and mortar. What categories should I be using for Google Business, I am not a retail store where people can walk in and buy things. Thank you
Online businesses are not eligible - you need to contact your customers "in person" during your business hours in order to be allowed a GoogleMyBusuiness listing.
Please refer to https://support.google.com/business/answer/3038177?hl=en for more info
Helmut Geissler, Google My Business Top Contributor | my G+ profile