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In this list I won't get into details about opening ports, accessing your router or setting up your firewall. However following commands should help you with debugging as well as making sure your server is visible on website server list.

Command	Description
name <server name>	Allows you name your server, this name will show up on server list if public is set to 1
public <0 | 1>	0 - makes your server not visible for online server browser 1 - server will advertise itself and if configured correctly show up on the server browser list.
heartbeat	Checks whether the server is visible to the master server and reports any detected issues (e.g., closed ports). Example: Heartbeat sent. Heartbeat: Port is closed. or Heartbeat sent. Heartbeat: all is good.

More commands are listed:
Player list/id: [More info]
Player directed commands: [More info]
Player skin commands: [More info]
Server commands: [More info]