So I am new to machining brass or metal in particular. I see the kit form Carbide3D for a branding iron (Branding Iron Kit - Carbide 3D). I would like to get the rectangle one and create something with my logo. Any tips from Shapeoko 5 Pro users and using carbide create to do it?
100% agree with @CrookedWoodTex .
Do some/many/enough tests to get the design and layout right before touching the brass.
Carbide has some videos on cutting metals/brass, watch those and do a thorough search on the forum here for milling brass branding irons, most likely someone has posted their recipes on speed and feed.