Authentication w/ web services - MS Dynamics 2016 API

Hi,

I need to create a node.js service that can query MS Dynamics CRM for data regarding contacts (kind of a bridge on top of the Dynamics Web API). I have read the documentation but I am confused as to which authentication protocol I should use.

I see references to OData, REST and SOAP. If I want to use OAuth, should I first declare my web service following these instructions? https://msdn.microsoft.com/en-us/library/dn531010.aspx

I see lots of references to ADAL to connect via Azure to the online version of MS Dynamics.

Could you point me to the right location on how to get started with a premise version of MS Dynamics?