Connecting Cisco router to the internet

I need help in setting up my cisco router so I can connect to my cable modem. I am planning to configure my router using EIGRP and RIPv2 instead of using NAT/PAT because my wireless router that direct connect to the cable modem already have build-in NAT so it won’t be such a challenge to use it. Anyone would like to participate to help me on this would be most appreciated.