how to set up a dual WAN on the firewall. Which will have a failover

how to set up a dual WAN on the firewall. Which will have a failover

#   

interface GigabitEthernet1/0/4

port link-mode route

description to WAN1

nat outbound                                                                                                         

 #  

interface GigabitEthernet1/0/5

port link-mode route

description to WAN2

nat outbound

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[F1KIRF]ip route-static 0.0.0.0 24 xxxx   // Configure the route to the outgoing interface of WAN1  

[F1KIRF]ip route-static 0.0.0.0 24 xxxx preference 100    //Configure the route to the outgoing interface of WAN2 to have lower priority