How to migrate an existing non-SAP-application

Hi,

is there anybody who has expirences and could help to answer some basic questions (within a little consulting project, of course)?

What topics would be relevant for such a project? There are so much different possibilities within that platform:

What is the right topic to realize the interface - xApps, CAF, Web Dynpro, Enterprise portal,...?

What could be the right subject for using an existing Database structure and existing (or modified) Web Services - IX, MDM, WAS, ..? (Data Entry over the user interface and data processing with the web services should us the same data from an existing database definition).

Our system (Windows-GUI, Windows platform, OOP, Oracle or SQL-Server) is a special application for a special branch (utilities). More information on demand.

Any hint is appreciated, thanks a lot.

Kind regards

Christian Hartlieb