In my video here I show a quick demo of how to include the components in your own web application.
Inevitably you will want to secure your web service layer at some point and if your are building on the Azure platform, then Azure AD is a great OAuth solution.
It is especially a good solution if you are building SharePoint Add-Ins in Office 365. When you are logged into your Office 365 SharePoint site you have already authenticated against your Azure AD and as long as you deploy your applications to the same Azure AD instance then you get automatically authenticated when accessing your Web API layer.
The general architecture looks like this.
The first video is up and it shows how to create a SQL Azure database, create a Web API layer and how to model and scaffold the data using Entity Framework.