Jira on DreamHost Dedicated Server

I am currently paying for a dedicated server and have been asked to run JIRA bug tracking software on it (https://www.atlassian.com/software/jira/pricing/?tab=download) instead of paying a monthly fee for it. This is over my head as all the DreamWiki says is

You will need a DreamHost PS to run JIRA as you need to run it on top of Tomcat and you will need to proxy it.

Is there anyone that can help me out with it? I just don’t know what to do with this to get it running.