Windows 2008 R2 Enterprise - cluster

Greetings to all

Please help me...

I must configure a failover 2 node cluster for database (which will be
on storage) within Windows 2008 R2 Enterprise x64.

I have two identicall servers and storage.

Since I am doing this for the first time I have some questions:

1. System will be in DMZ so not domain just in workgroup

- is it necesary this node servers to be members of domain ?
- is it possible to do cluster in non domain (workgroup) enviroment ?

2. Also does somebody have some example (web guide or something) how to
configure cluster heartbeat network adapters

Thanx