Display SAP BW Queries and Workbooks in a web enviroment (.net)

Hi we are beginning in SAP BW and we need to display in a web application SAP BW queries with and without selection parameters.

How can we do it? :

Have we to design elements with the Web application designer?

Can we use directly the queries that are created?

Can we call with rfc functions the queries?

Have we to use WAS?

Any suggestion are welcomed.

Thanks in advance.