I don't have serverdz.cfg in my downloaded server files.

[maccrawinthejaw 0]

I'm having a hard time setting up a server because I don't know if a "serverdz.cfg" file was supposed to have been downloaded with the server tools on Steam (I validated and it still isn't in there) or if I'm supposed to create it myself, and if so, I don't know what I'm supposed to put in it.

[Hawkeye[GSC] 0]

Search "How to setup a Dayz Standalone Server" there are a few Videos on it and they include there variants of the serverdz.cfg" some also have a starter.bat as well to help with your initial startup of your server. good luck 

[SmashT 10907]

It's not included in the install. You will need to create one.

You can find the serverDZ.cfg config parameters here

The file usually is located in the root directory of the server but can be placed elsewhere with the startup parameter -config. By default the file would go here, C:\Program Files (x86)\Steam\steamapps\common\DayZServer\serverDZ.cfg

This is what mine looks like if you want an example to copy paste and save it as .cfg.

hostname = "SmashT";         // Server name
password = "password123";         // Password for connection to the server
passwordAdmin = "password123";         // Password to become server admin  
steamQueryPort = 2305;
 
 
maxPlayers = 100;         // Maximum amount of players
 
 
verifySignatures = 2;         // Verifies .pbos against .bisign files. (use only 2)
forceSameBuild = 0;         // Server will allow connection only to clients with same exe revision as server when active (value 0-1)
 
 
disableVoN = 0;         // Enable/disable voice over network (value 0-1)
vonCodecQuality = 7;    // Voice over network codec quality (values 0-30)

 
disable3rdPerson=0;         //turn on/off 3rd person view for players on the particular server instance (value 0-1)
disableCrosshair=0;         //turn on/off cross-hair on the particular server instance (value 0-1)
 
 
serverTime="2015/4/8/9/00";         // Server Start Time         // Initial ingame time of server. "SystemTime" means local time of machine. Another possibility is to set the time to some value in "YYYY/MM/DD/HH/MM" format, f.e. "2015/4/8/17/23" .
serverTimeAcceleration=15;         // Accelerated Time (value 0-24)        // This is a time multiplier for in-game time. In this case time would move 24 times faster than normal, an entire day would pass in one hour.
serverTimePersistent=0;         // Persistent Time (value 0-1)        // Actual server time is saved to storage, so when active, next server start will use saved time value.
 
 
 
guaranteedUpdates=1;         // Communication protocol used with game server (use only number 1) 
 
 
loginQueueConcurrentPlayers=5;         // Number of players concurrently processed during login process. Should prevent massive performance drop during connection when a lot of people are connecting in the same time.   
loginQueueMaxPlayers=500;         // Maximum number of players that can wait in login queue

 
 
instanceId = 1;         // DayZ server instance id to identify number of instances per box and their storage folders with persistence files
lootHistory = 1;         // how many persistence history files should been kept by instance, number is looped over during save
storeHouseStateDisabled = false;          // Disable houses/doors persistence (value true/false), usable in case of problems with persistence
storageAutoFix = 1;         // Checks if persistence files are corrupted and replaces corrupted ones with empty ones (value 0-1)
 
 
class Missions
{
    class DayZ
    {
        template="dayzOffline.chernarusplus";        //used mission         //first part is mission name, second part is used map
		serverTime="2015/4/8/9/00";  
    };
};

I found this guide for setting up a windows server to pretty straightforward for beginners setting up a server for the first time.

https://write.corbpie.com/installing-and-setting-up-a-dayz-standalone-server-on-windows-server-2016-guide/