Media for Cisco router to replace my netgear

what configuration do I need to put in?

My router 2621 has two fastethernet interface. One will be connected to cable modem Fe0/0 and the other switch. (fe0/1)

I learned that I need to put int "ip address dhcp" on fe0/0 and what else?

to make my other PCs to go to internet through Cisco?

I would need to configure dns and default gate way, right?

when cisco obtain address through dhcp, does it also get

dns and dhcp address? If yes, where do I find it?

If there's any guide on cisco site, please let me know the link

Thanks

-Thomas