For the table data, you need to implement a model which will hold the data. If you don't require anything special, you can just subclass QAbstractTableModel.
Quoting the most important parts from the documentation:
When subclassing QAbstractTableModel,
you must implement rowCount(),
columnCount(), and data().
Editable models need to implement
setData(), and implement flags() to
return a value containing
Qt::ItemIsEditable.
You haven't specified where you get the data you are going to show in your table. That determines how you need to implement the required functions.
For even more simple model, use QStandardItemModel which already has a basic implementation for all required functions.