How can I integrate Office Web Apps (configured with SharePoint 2013) into my ASP.NET Web Forms application ?

Hi,

I have Office Web Apps which is configured with SharePoint 2013. The documents are stored in OneDrive & they are accessible using SharePoint 2013. The ASP.NET (VB.NET) Web Forms Application will display list of documents from OneDrive with their respective links. I want to access Office Web Apps using this ASP.NET (VB.NET) Web Forms Application (user will click on document link) to open & edit content of a document from OneDrive & then save it automatically. Do I need to use SharePoint 2013 as a WOPI host or create a new WOPI host?

Please provide step by step solution for the above.

Thanks in advance.