[mooki]

You need to learn enough Java to get around, and how to interact with it through Clojure. Java libraries are very comprehensive and well documented, but if you're fresh to both languages the learning curve is steep.

It's sorta possible to get around with pure Clojure, but not very practical.

Leiningen is the de-facto package manager so use that for everything. Clojars and Maven are the two repositories.