where to start and how to implement High availability and disaster recovery with sql server 2012 Enterprise deployments ?

Hi,

we have a plan to deploy a huge sharepoint 2013 internet portal and we are using sql server back end.

the daily concurrent users are 500 to 1000 

and for sql server cluster and  high availability ,disaster recovery what recommendation we will implement 

and how to implement these scenarios

for where to start?

adil