Q: Our office is planning to buy 200 ipads.

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Wise move. You should get ipad that are dep enabled.  This establishes to the ipad software that the device is owned by the corporation not the end user.  Thus, the user cannot lock the corporation out of the device by setting an activation lock. Somehow, when you order the device you say you want it dep enabled.  Talk to someone at apple.

Enterprise

1-866-752-7753

https://help.apple.com/deployment/business/#/tes6d9dc7acf

"This document offers guidance on some important considerations for getting the most out of your iOS deployment." Covers: Prepare your infrastructure.  Set up devices.  Configure and manage devices.  Deploy apps and content.  Plan for support. 

https://www.apple.com/business/docs/iOS_Enterprise_Deployment_Overview.pdf

Quick overview of zero touch deplayment

http://www.apple.com/education/it/dep/

Consider DEP, Device Enrollment Program. Use VPP, Volume Purchase Program.  Select an MDM, Mobile Device Management.  Read the Google doc below and nsdjoey write up.

    Overview of ipad & iphone deployment.   

      It's education focused.

      http://www.apple.com/education/it/

    Writing you own app for your business:

      https://developer.apple.com/enterprise/

    MDM --  Mobile Device Management  

      https://developer.apple.com/videos/play/wwdc2015-301/

      For a comparison see this page:

      http://www.enterpriseios.com/wiki/Comparison_MDM_Providers

    VPP -- Volume Purchase Program

      http://www.apple.com/business/vpp/

      http://www.apple.com/education/it/vpp/