Create an xmpp server

I need to have an XMPP server set up on a virtual server that I already own and for a domain that I already control. The server needs to be as secure as possible. I want the candidate to set up the server and then train me to maintain it, which will mainly include adding and removing accounts. I also need the server to automatically delete all messages and media after 7 days. If you have the necessary skills, please contact me.