Server for MMORPG

For the first prototype we will create such as in EQ2 - Zones. So for this reazon we need that the server per zone synch data with database for Character, Mobs, NPC and so on - for prototype this will be enough. In what place we must start to look, and can we realize this modified only source code of the UE or we need to take external tools such as Racknet and so on?