Figured I'd have a topic for compiling a list of customizations that are useful for anyone who wants to run a ATM3R server. I had to do a LOT of learning when I first started running a server and I sometimes wish this information had all been compiled in one place. There is a GREAT deal of information on running Sponge, Bukkit, Spigot, Cauldron, etc servers, especially with plugins which make life WAY easier... but Forge seems to be the redheaded stepchild of the Minecraft works. There's very little information, and even less support for running Forge servers. As best as I can tell, people either run SpongeForge and deal with the instability, or they write custom mods/scripts to handle everything and never release anything.
This is a how-to get set up and use MultiMC, which is an alternative to the Curse/Twitch/FTB launchers.
Get it here: https://multimc.org/
Get All The Mods 3 - Remix 1.6.0 here: https://www.curseforge.com/minecraft/modpacks/all-the-mods-3-remix/files/2990415
Unzip/install MultiMC and open it. Select your language:
Choose a java version, typically the default is fine. Be sure to change your maximum memory allocation...