Hi Go,
Welcome to the group! Bitumen Framework is a collection of libraries for catering to different aspects of web development. Every library has its own tutorial/documentation, but there is no comprehensive document that describes how to put together an application using those libraries. I am these days trying to bring Clj-DBCP and SQLRat to the next version, which should make accessing databases further easy in Clojure. I am planning to put together the Lilliput-Clj sample application after that.
Which language do you want to start developing apps in? Feel free to ask questions -- I will try and answer how to use Bitumen Framework for your use-cases.
Regards