Looking for advice on setting up drives for VMs on Hyper-V

Hardware - Xeon E3 server, 16GB ram, 256Gb SSD, and 7 3-4 TB drives

Hyper-V core 2012 R2 installed on the SSD - did not take much space

Goal: To setup 2 VMs, one Windows Server Essentials 2012 R2 (use=home server) using a majority of the space, and hopefully backup space too, and a separate VM for Ubuntu LAMP server for learning.

I have a separate machine with Windows 8.1 Pro, remote desktop to the Hyper-V computer is working as is Hyper-V Manager.

I have 7 HDDs, right now all in one storage pool.  That might have been a mistake, as some of those drives are supposedly for server backup.

Questions:

Should I plan on installing WSE 2012 R2 to the SSD? 

Should I create one giant drive from the storage pool, or separate drives for the VM uses.  I guess I am not sure whether to create one giant storage space, and then create multiple VDHX drives as needed for the VMs.   Can WSE 2012 backup to a Virtual Drive?

For instance should I create one 1TB storage space, format it, give it a letter, and then create the VM for the Ubuntu LAMP install?

Create another storage space for the data for the WSE, and another for Backup space for WSE?

Any suggestions will be appreciated.

Thanks, Ross