Java getters and setters
Your getters and setters would be for fields of the class, not passed in.  I'll use your two simplest ones as examples for you to work from.

public String getCustName(JTextField name){
    return name.getText();
}

public String getPhoneNum(JTextField phone){
    return phone.getText();
}


These methods make no sense if you think about them logically.  Your client code will pass in a JTextField that it already has, in order to invoke getText() on it?  Why wouldn't that code just do it itself?

Here's how getters and setters work:

private JTextField myTextField;

public String getMyTextFieldValue() {
    return myTextField.getText();
}

public void setMyTextField(JTextField newTextField) {
    myTextField = newTextField;
}


That's the general principle behind getters and setters.  You should be able to extend that logic to all of the other methods as well once you understand the logic.