Exchange 2010 build guide template just released on TechNet… You can use these templates as a starting point for formally documenting your organization's server build procedures for servers that will have Microsoft Exchange Server 2010 server roles installed on them. Templates are provided for the Client Access, Hub Transport, and Mailbox server roles, plus a template for the Mailbox role configured for a database availability group. Get the guide from

http://www.microsoft.com/downloads/details.aspx?displaylang=en&FamilyID=5f9dbd88-dadf-4ad9-9f28-ad35a1ab1da2