Clustering Pre-reqs for sql 2012 always on availability group

Hello,

I'm currently in the planning stages of building a sql 2012 alwaysON cluster on Windows server 2012. I'm a bit confused with some of the requirements.

Does  windows 2012 clustering require a heartbeat network as well a nic that communicates with the domain?

For a 2 node 2012 always on sql cluster which type of cluster should I use? node majority? node majority plus fileshare?

thanks!