For Notifications, refer QMEL - ARBPL field for work center. Based on that field & Created on value (QMEL - ERDAT), you can get the no. of notifications.
For Orders, work center can be assigned at Header level as well as Operation level.
For Header Level, use AUFK - VAPLZ field with AUFK - ERDAT for date range.
For Operation Level, use AUFK - ERDAT to get no. of orders (AUFNR). Pass your Work Center in CRHD to get OBJID. Then pass OBJID & AUFNR in VIAUF_AFVC to get appropriate AUFNR.