Cisco 877 not routing internet from external to internal

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Hi im new to Cisco and ive been trying to get this modem router working for a few hours now and cant get my head around it.

I am trying to just set this up as simple as possible with an Optus ADSL connection, I can sucessfully connect to the internet and i can ping externally from within console but i have no internet connectivity from my internal network.

Using Cisco 877

I have attached the config i am using, it would be greatly appreciated if someone could help me. Thankyou

 

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Your NAT config refers to access list 101, but I can't seem to find it:

Try adjusting it to ip nat inside source list 1 interface Dialer0 overload