What would be the best way to create Invoice Items with vb.net?

Right now I use a datagrid to display all the customers in the db....then when you click on a customer in that datagrid it opens another form which displays all the invoices for that specific customer..It displays them in a datagrid as well.

Now, what I am going to do is, have a button "New Invoice"..when the user clicks this...it will open another form to create a new invoice... I'm not sure of the best way to add the desired Part Numbers to the Invoice form so that it's simplicity is at the lowest level..but also looks good.

I have thought of just Using Another Datagrid...but when you first load the form...the datagrid will contain nothing and might not look right..

Another option was just using labels and textboxes and binding them to the db?

I'm not sure of what the best way to do this would be??
Maybe there is a better control do implement this or just a better all around way.

Any suggestions is greatly appreciated!

Thanks in advance!