I've written a small doc on how you can set it up (not going into the process of the IPv6 network itself, but just talking about setting up NAT64...): http://docwiki.cisco.com/wiki/IPv6_only_setup_with_NAT64

If your ISP does not give you IPv6, you can get it for example at tunnelbroker.net - though beware that the properties of that connection, primarily when talking about MTU will be slightly different than from the "native" one.

Feel free to give a read and leave the feedback - I'll be happy to tweak the document to make it more friendly/useful.