as for the total price, eCart will show shipping tax and the total price before the order is processed
the user will need to fill in the checkout form, this goes to the confirm page, on the confirm page, the shipping is calculated. and the final total price is displayed before the order is processed.
In the new version of eCart, the credit card information is collected on the confirm page as well.
Notifying the user about the rights to send back goods within 14 days would be information you as the developer would add to the site.