Hardware requirements for Windows 2012 R2

Hello All,

We have currently a forest as A.com and we are using Windows 2008 R2 Sp1 in that

We have 350 user accounts in that.

We are planing to introduce a new domain or Forest as B.com with Windows 2012 R2

This new domain should be able to handle 1000 user accounts.

kindly suggest me with hardware requirements for Domain controller 

Also How many domain controllers we need

Thanks,

Sam