Small Office VDI Liscencing

I'm converting a small office to a Virtual Desktop Infrastructure.

I want users to use Remote Desktop to access windows 7 virtual machines running on a central server ( Server 2012 Standard ).

There are three machines that need to have persistent states where users can install software, move desktop icons, and save files.

Six other machines in the office only need to run one piece of software and nothing else. All data for this software is on a network drive so these terminals could be running full virtual sessions of a generic windows desktop.

I'm trying to figure out how to implement this in a cost effective way.

I tried looking into the various licensing options, but given how small the office is would it be cost effective to purchase 9 windows 7 licensees?

I read that server 2012 can create virtualized instances of itself and that the number of instances can be increased by purchasing seats? This would also be acceptable alteative to windows 7.

I'm a little lost with all the options and am looking for some guidance to get me started

Thanks

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