First you need to download all required files:

1. Download Server Files. Path to server must be only with english characters.
2. Download Server Launcher
3. Register your server here
4. Run ZServer.exe
5.1. In ZServer add server exe and set params to this for BFBC2:
-zlogin ChangeMe -zpass ChangeMe -port 19565 -mapPack2Enabled 1 -serverInstancePath "ZEXEPATHZ/InstanceBC2/" -timeStampLogNames 1 -region OC -heartBeatInterval 300000
zlogin and zpass - from step 3.
5.2. In ZServer add server exe and set params to this for Vietnam DLC:
-zlogin ChangeMe -zpass ChangeMe -port 19566 -mapPack2Enabled 1 -serverInstancePath "ZEXEPATHZ/InstanceDLC/" -timeStampLogNames 1 -region OC -heartBeatInterval 300000
zlogin and zpass - from step 3.

In InstanceBC2 or InstanceDLC edit ServerOptions.ini and replace all ChangeMe to something useful.

Use Procon Frostbite to configure your server.