How do I make an Add Customer Screen with the following requirements using JavaFX?:

Stimulus/Response Sequences The employee opens the application. The employee logs into the application. The employee selects Add Customer from the Action menu. The employee enters in the customers first name, last name, email address, phone number, address, city, state, and zip code. The employee presses the Add Customer button to add the customer. The system responds telling if the customer was added successfully or if there was an error. Requirements 1: Verify the employee has logged in. 2: Verify that the customer was successfully added. 3: Validate that all the input fields have been entered. 4: The successful insertion confirmation message must include the name of the customer that was added. 5: Display any errors (like missing fields) in an appropriate fashion, e.g., beside each input field or above all the input fields. 6: All input fields should be cleared if and only if the insertion was successful. 7: A customer must not be added if there already is a customer with the same first name and last name in the database. In this case an appropriate message must be displayed.