The selections you make here will be used, by default, on new sales that you create for this card. You can override these selections when recording a sale.
Given that this customer card is for cash sales and you won't be invoicing any customers, you would probably select Already Printed or Sent as the Invoice Delivery option.
If you want to learn about each option, hover your mouse over the field to display the field help (you'll need field help turned on, go to Help > Show Field Help).
If the Printed Form and Invoice Delivery fields are not shown, make sure the Sale Layout field isn't set to No Default or Miscellaneous.