Migrate from single server to multiserver path?

I'm looking to move from a single Exchange 2013server to multi server for HA, i.e. multiple database servers and client access servers. What the best way to migrate? I would like to keep the existing single server as a client access server. I'll
be using a hardware load balancer for the client access servers.  Existing 2013 Exchange server has Windows 2012 Datacenter installed.
Can just make a new database sever and create a DAG then create a new client access server then configure the load balancer?
Thanks for any input on how to migrate from a single server to multiple server for additional HA.
 

Is there any benefit to using Server 2012 R2 vs Server 2012 R1? The single server is currently Server 2012 R1.  Can I do an in place upgrade from 2012 R1 to R2 without messing up Exchange?
Here's my thoughts so far:
1. Make 3 additional 2012 R1 servers
2. On 2 of the servers install additional Exchange servers with mailbox database roles (it appears each new mailbox server comes with a database which I'll delete).
3. On the last new server, install CAS role
4. Create DAG with all 3 servers with database role
5. Add production database copies to DAG
6. Configure load balancer for CAS load balancing
Thoughts?  Is the production database on the single server available while a copy is being made to the new mailbox database servers? Also, I thought I read some where to move mailboxes to DAG, but I don't see why if I can just add copies of the existing
database to the DAG group.
 

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