Workbook named BaseWorkbook is open.

How do I write the following in Excel VBA:
Open C:\MyFolder\MyWorkBook.xls
Is there a worksheet named "ABC"
If No Then
Put text "No 'ABC'" in D4 of BaseWorkbook
End
If Yes
Go to "ABC"
Is the text "XYZ" in Column B
If No Then
Put text "No 'XYZ'" in D4 of BaseWorkbook
End
If Yes
Put value in column L of row containing "XYZ"
in D2 of BaseWorkbook
End

Thanks!

Steve