How do I run a headless Mac Pro

I have a new Mac Pro (it's awesome) and I have a macbook pro with a Thunderbolt monitor and bluetooth keyboard/trackpad etc. I have been able to use screen sharing to connect to the mac pro and I don't have any problems with resolution as some people have reported.

The problem is that anytime I have to reboot the mac pro the screen sharing and ssh services don't appear to start up until I log in. So I have to go hunt down a physical keyboard and plug a monitor into the macpro just so I can log in. Then I can disconnect and everything is fine until the next reboot. I'd like to know how I can configure these services to be available at startup without someone logging in. I know other people have done it. Could filevault be part of the problem since you have to log in to decrypt the drive maybe?