Make changes to website -- 3

I need some changes to an existing website. Make changes to 3ashades.com. We would like to make changes to our website www. 3ashades.com. Before submitting offers, we would like freelancers to visit [login to view URL] and go through every single detail and compare all features with selectblinds.ca. We don’t want to make it copy of selectblinds.ca. our website should have its own unique look. It will give you ideas how our website should be viewed by visitors compared to select blinds . We want to make our website look very professional and easy to use on all kind of devices. Freelancers who will go through all details, find all issues and submit with proposal will be given priority. Here are some of changes we want to make but there are other features that can be changed. 1)Make payments In Canadian dollars only. 2)Make categories banners smaller for computer screens 3)Better showing error messages 4)We should be able to change formula to calculate prices as prices change by sizes. As of now there is only one formula for all products. We need to change formula for different products. 5)Offer warranty options at checkout by percentage of cost price. We should be able to set up percentages. 6)Save screen space and time on cell phones. 7)Sub category should be optional not mandatory. 8)Sub width and height text field should not be mandatory(should be able to leave text field empty) 9. Fully responsive, Simple and easy to use for cell phones and tablets. 10. Create option for customers to register warranty online. Warranty to be approved by Admin