こういうファイルを作って，
/Library/LaunchDaemon/org.hoge.hoge.plist:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd";>
<plist version="1.0">
<dict>
<key>Disabled</key><true/>
<key>Label</key><string>org.hoge.hoge</string>
<key>OnDemand</key><false/>
<key>ProgramArguments</key>
<array>
<string>/usr/local/sbin/server</string>
<string>argument1</string>
</array>
<key>RunAtLoad</key><true/>
</dict>
</plist>

コマンド実行
$ launchctl -w load /Library/LaunchDaemon/org.hoge.hoge.plist