May want to look into VB.Net if you're going to code with the CLR and/or SSIS. For the rest, it depends on what you need to do. There are several books that will give you a good overview of VBScript, but without knowing your goal, it's hard to recommend something that goes deeper.
I'd probably start with some of the books - you should even be able to get slightly older VBScript books relatively cheap. They'll still have information relative to your coding. Check O'Reilly or Wrox to get started - they generally have good books.