Assuming that you already have Excel on target PC...
You can start with this declaration
Dim xl As New Excel.Application
Dim xlsheet As Excel.Worksheet
Dim xlwbook As Excel.Workbook
And you can add reference to "Microsoft Excel XX Object Library"
Also here is some short commands... as example from where to start... you can explore more of them, or if you use VBA commands are same..
Set xlwbook = xl.Workbooks.Open("c:\book1.xls") //This one opens workbook
Set xlsheet = xlwbook.Sheets.Item(1) //This one selects sheet... xlwbook.Sheets.Add(...) adds new sheet ... etc...
xlsheet.Cells(row,column).value = "A" //This one add value a to cells with assigned coordinates... almost same as Range...