help Configure NAT Overload on home lab

[lildeezul]

Hi everyone. I have trouble configuring Nat overload on my network.
Ok..... this is what i have.... ( i will use fake IP address for secuirty)

When i go to whatismyip.com it tell me 68.183.89.226
I have a netgear cable/modem that has a wan Ip address of 68.183.80.1
this ip addressing scheme has a 225.255.240.0 mask.

I will be configure NAT on router 1...
this is what i understand. when i use the command...

ip nat inside source list NAT_ADDRESS interface e0/1

now to my understanding. Whatever the ip address on int e0/1 is, my computer will be translated to this ip address...
now so this is where im confused.. Do i make the ip address on e0/1 68.183.89.226 becuase this is my WAN ip address, and since the ip address on my computer will bet translated to whatever is on ether0/1... and thats what the ip address i use to access internet?
????
is that correct... IF not what should i have my e0/1 ip address configured at..
Also i spoke to my ISP and they are only leasing me one ip address...
also my netgear cable/modem is a DHCP server, and it is giving ip address to my host..
if this is confusing. I am making a network diagram right now so will i can show yall how i am hooked up...
basically i dont know what to set my e0/1 ip address to..???

Heres my setup
the modems IP and internet IP is stated above in the post.
what do i set my e0/1 ip address to be so that i can access the internet.?? to my understand should my computer be translated to 68.183.89.226 because this is what the isp give me... am i correct ?