Lion 10.7 ssh-ing from outside
I have never had a server OS before but just got myself a new mac mini server with Lion server installed. The point of this was so I could ssh my machine from work and access my files from wherever I am. Sadly, I seem to be only able to ssh my machine when I am on the same wireless network. How do I ssh my machine from outside this network?
The thing I tried was turning on Remote Sharing which gave me an IP address to ssh, but this does not work when I am outside the network.
Thanks for any help and sorry if this appears as a grossly newb question,