 <p>jBilling has both installation guides (for <a href="http://www.jbilling.com/documentation/users/installation/windows" rel="nofollow">windows</a> and for <a href="http://www.jbilling.com/documentation/users/installation/mac-linux" rel="nofollow">mac/linux</a>) and a <a href="http://www.jbilling.com/documentation/users/getting-started/mediation" rel="nofollow">Getting Started Guide</a> on their website that list each step and walk you through the process. Try starting with those.</p>