Wordpress WP E-Commerce Plugin Customization

Dear Freelancers, i am currently working on a website and I have to integrate the Wordpress plugin WP E-Commerce there. I already integrated the plugin and made all settings. Anyway there are 3 problems left and I need them to be done within the next 1-2days. I will describe the problems here: 1) Transaction Result Page I have manual payment and pay per paypal standard installed. After a user bought something he will be forwarded to the transaction result page. I want to delete some text there and add some new text. Also the buyers need to see two different result pages because the result page for manual payment should look different then the result page after payment with paypal is done. I do not know if that is already integrated in the plugin but I need to enter my own text on the result pages. 2) Shipping Cost Problem WP E-Commerce uses the shipping calculator. Well I do not need this option. I just have fixed shipping prices. If someone buys something there is a fixed shipping price. Right now the fixed shipping price is not working at the checkout. Even when I check it in the admin panel. I do not know why but this has to work. So no shipping calculator, only fixed shipping prices. 3) Notification E-Mails I installed the plugin wp shop styling which creates good looking email templates. It is working great but the problem is that someone who bought something gets two e-mails right now. The one from the wp e-commerce plugin and the one from the wp shop styling plugin. This should be changed. Only the e-mails from the wp shop styling plugin should arrive at the buyers inbox. That´s it. Those are small changes but I need someone who is an expert in wp e-commerce and can help me out within the next 1-2days.