CaptainHouse

Definitely switch to Linux. Windows uses a ton of background tasks that eat up your resources.
Learning how to use Linux isn't too difficult, I recommend checking out this video.

Take a look at this : https://steamcommunity.com/sharedfiles/filedetails/?id=360404397 

then the most important question is your internet connection here.
 
every person playing on your server will need some bandwidth from your side especially the upload is important.

You can then use the "Task Scheduler", schedule a reboot and place a .bat (or whatever you want) to start the programs you want at boot time.

if you have a basic knowledge of linux, and your preferred software works on that side, i'd say thats the way to go.
 
on the other side, if it's just for running some game server for you and a few friends (note that this bit is bolded..) you may as well just toss windows 10 on there, and do the reboots manually every sunday, as long as your preferred games arent coded by a mentally challenged monkey once a week shoud be plenty.

If you're going to be running a normal windows install as a "server" you'll want to look into task scheduler. If you're going to be using a linux install you'll need to look into crontab.