Take a look at the core of what you need to know here:
http://startupfashion.com/fashion-ecommerce-website

I answered these questions for those starting their own eCommerce store, and that is a great resource for you to get going! Feel free to reach out to me directly for more tips, we can set up a call.

Late to game here but Matt from Demac media in toronto is one savvy magneto eCommerce guy...reach out