I don't know if GeoServer have the right tools to "load spatial data to my oracle db" since it is not an ETL.
I suggestion you follow your other thread for that: Need Help about Spatial Data Load - Mapviewer
Once it is loaded you should follow some instruction on GeoServer documentation to set it up to server the sdo_geometries and sdo_georaster direct from Oracle:
"GeoServer does not come built-in with support for Oracle; it must be installed through an extension..." Oracle - GeoServer 2.1.1 User Manual
I hope that helps.