I don't think the devs will flesh out only the popular jobs and trades and leave the rest in the dust for NPC work. Everything is connected and they're even making as close to a real economy as possible. There is some 'set it and forget it' alongside brewing, but I would imagine the timing then would be all the more important, such as how long to brew, when it's done brewing, etc. I think it will have a similar system to cooking. Have you been to a brewery before? Tours are usually free and they're very informative. Some tours give you free beer. Go get drunk and do research for CoE :P
As for the labels and everything, devs have said you can put your seal or crest on belongings to show they're yours. I don't see why that wouldn't work for a brand you create. Appraisers will probably have the ability to find out where items originate from, so it would just be a matter of people associating that label with you, which would be entering the fame system.