##Install Java
Install any version of Java JDK >= 1.5 You can download Java using your system's package manager or going to http://www.oracle.com/technetwork/java/javase/downloads/index.html
##Install Leiningen
Leiningen will help us automating some common tasks like installing dependencies and running the REPL. The installation procedure changes if you are in a Unix like system or in Windows. If you have any problems, there is more information in Leiningen's page: https://github.com/technomancy/leiningen