First off, I apologize if this is the wrong *fault section for this question.
I'm in a small shop with 13 computers. 12 are running Windows 7 Pro (until they fix roaming profile start menus) and one is running Server 2012r2 (2016 once it comes out). We need 12 copies of Microsoft Office Professional. The average cost per copy is $400 on newegg since we need Access.
I'm trying to understand how volume licencing works. I'm a pirate turned IT Admin so this whole legitimate thing is new to me. If I wanted to get 12 licences for 12 computers that will be used by an unknown number of people, how would I do that. Also can I put SQL Server 2016 and eventually Server 2016 on it and if so how.
My final question is, would I be better off just buying the copies from Newegg instead and forget about using Volume Licencing all together?
What would cost the least?
I feel like VL is more for businesses having more systems than licences where less than every system is in use. So any help would be great.
Edit:
You know, marking this as a duplicate once was enough. Hitting me four times is just rude. I can't make comments anymore. This just discourages new people from asking questions. Also, the listed article was just as helpful as the listed answer. The real answer to those who are viewing this question is simple.
Don't ask for Volume License related question on Stack. Call your Microsoft License Dealer in your local area. You'll avoid a reputation beat down and get a real answer.