How to modify a table in word with VBA

I have tables that I am creating, and I want to be able to modify them through the code in the VBA.

What I need to do to the tables is merge and resize some cells and also add text to some of the cells.

To append on what Lance was saying, here's an example of Merging Cells and setting text in the value of those merged cells:

Dim myCells As Range
With ActiveDocument
    Set myCells = .Range(Start:=.Tables(1).Cell(1, 1).Range.Start, End:=.Tables(1).Cell(1, 3).Range.End)
    myCells.Select
End With

Selection.Cells.Merge


ActiveDocument.Tables(1).Cell(Row:=1, Column:=1).Range.Text = "Value for Merged Cells"

NOTE: The table in this example had three columns and two rows