I'm not trying to be rude here but have you read the Lync implementation documentation at all? Everything you are asking is clearly explained there in.

You will need a Domain COntroller, as the servers will belong to the domain and your user account will be created in AD.

Exchange

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.

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