Once you have the file open in VB, create a Range and then do your formating. Also, best way to find out how to do anything in Excel or Word is to record a macro.
VB Code:
Dim objExcel As Excel.Application
Dim objWorkSheet As Excel.Worksheet
Dim r As Excel.Range
' section opening Excel not included.
' open the file
objExcel.Workbooks.Open "C:\my documents\newfile.xls"
' create reference to sheet3
Set objWorkSheet = objExcel.Worksheets.Item("sheet3")
' activate sheet3
objWorkSheet.Activate
' make it visible
objExcel.Visible = True
' create range object
Set r = objWorkSheet.Range("B1:B35")
' set text alignment and Currency
r.NumberFormat = "$#,##0.00"
r.HorizontalAlignment = xlRight
r.VerticalAlignment = xlBottom