1) Either set the forms action page to go to the success page. Or open the server behaviors panel, double click the Universal Email server behavior and set the Go To Page.
2) In Dreamweaver, The main view is Design View, you should have buttons to allow you to select Code View Or Design View.
to open the property inspector, go to Window -> Property Inspector.
It doesn't look like you have added an HTML Editor instance to your form, though, so you wont be able to edit one.
To attach a copy of your page, compress it to a zip archive and attach the zip file.