Find a record on a form

Hi Guys
Just need some basic help in finding a record on a form which displays customer details.
I have a combo box on the form with lists Customer Names. I want to click on a customer name in the combo box and the records are displayed on the form for that customer.
I created the form using the wizard and I'm not too familiar with the way it sets up the recordsets etc.

This is how the form is loaded if this helps.
Set grdDataGrid.DataSource = datPrimaryRS.Recordset("ChildCMD").UnderlyingValue
Thanks Norm