Please read this pinned post, and take a look at the links in the post: Basic skills and interests you'll need to be a MineOS admin.
use the command “java -jar [server jar file name]”
the logs are here:
MineOS log: /var/log/mineos.log
Minecraft server log: /var/games/minecraft/servers/servername/logs/latest.log
Unfortunately I d not know the right java version for each server type or version, but search this forum for your server version to see if anyone else has had any problems. Most often their post have the solution