The Personas add-in needs to be installed and configured in each system (assuming you don't go for the central deployment model, which most people don't). Don't forget the kernel. Once it is installed and running, the flavours you have built in your DEV system will just transport, along with media files, groups, etc. Look for "Transport Objects" in the Genral section of the Admin UI.
And when you make changes, just re-transport the changed flavours.
Steve.