Customize shopify e-shop

Hi every one We are building a furniture's e-shop on shopify, our main feature is that users can upload a picture of the furniture they want and we build it for them, we also will have a catalogue, any item in our catalogue can be request in different size and color. We are using Retina Theme: [login to view URL] We want to finish all functional features and then work on the design of the website, this project is only about functional stuff (please let me know if I'm doing it backwards) So what we need is: 1. Redirect domains, we alredy own [login to view URL] and fotomueble.com.mx. (We don´t want that appears shopify in the url) 2. Integrate a Wufoo form, we use it to request furniture's info, but we dont want that users goes out of the domain of fotomueble, when they fill it. 3. Integrate Mercadopago as a payment method [login to view URL] 4. Add a quotation button on every detail view so users can request a quotation of furniture that is in the catalogue, but in different size, color or material, this button should be optional because not every item can be modified. We also expect your advise in technical stuff. Please feel free to ask any question Regards,