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You can use any name eg IPSEC-1, IPESEC-2 etc
The WAN Port and LAN port are the same. eg first rule would use have port 50 in WAN and LAN port.
Destination IP is the IP address of your device.
You should make the IP address of your device static so that it doesn't change every time you connect the device.
There are two Telstra Gateways called Telstra Gayway Max, one for cable C6300BD and the other is a DSL modem TG799. Which modem do you have.
If you have the TG799 there is a link to a unofficial manual for the Telstra Smart modem in this post which has a similar GUI. See section 8 and 9