The Builder License is tucked inside Agentic Studio settings as a five-seat allocation. Without one you can modify agents but not create them. Sort it before you start, not halfway through.
Agentic Studio has a debug console you open by adding debug=true to the conversations URL. The setting is cached in the browser, so if the panel does not appear, hit ctrl+f5.
Agentic Studio is good and it is new, which means things change, the docs sometimes lag, and half of what you learn arrives verbally. Scope one Cowork space to it and let the space remember for you.
Sitecore encourages you to build widgets by prompting for them. Widgets are also the one thing in Agentic Studio with no export at all. Worth knowing before you plan a path to Production.