Trade skill vs. License?

Sorry in advance for making this more confusing than it probably should be!

I read and understand that there is a 'trade' skill for a couple of build I can purchase that deals with the commodity cards.
My question(s) is this...I heard that there is such a thing as a trade license. Available for a few gold rather than build. Now if this is a real thing, do both the 'license' and skill go hand in hand? (Example, I buy the skill to be a baker and getin trouble because I didn't pay for the license)
Do I need to spend the build to become a baker to sell actual cookies? Or can I purchase this trade license and just go about my buisness, saving those couple build?
Ultimate goal is to make some coin and focus my build spending on advancing my character, instead of something I'll barely make use of.

/end rant
-Kate Bober aka Akira Saralonde

Trade skills (such as Trade:Baker) will let you earn commodity cards that you can collect, trade, sell, and turn into lifestyle build.

A trade license can be purchased by the Seneschal for a gold. The license allows you to legally sell your wares in the Inn (like at Market Faire).

It's cool role play to have the trade skill on your card to go along with what you're selling, but that is flavor for your character. It is totally up to you wether or not you'd like to get the Trade skill, but you'd have to go to the Seneschal in order to sell your real cookies (and I'll be first on line to buy them! )

Ahh, wonderful! Thank you so much! Where do I find the Seneschal?

The player is Larry Wile. the characters name is Rudolf.

Thank you both very much!