start for fashion e-commerce portal

Dear  Friends,

I want to start a e-commerce portal / website (B2C business to customer ) for my products (right now garments specially ladies-wear,  but  can further can be expanded on to more category or items  too)

Therefore I needed your expert advices and guidance on , what to give in its various features to make it

1. User/ customer friendly
2. Administration friendly
3. SEO search engine optimization and automated SEO friendly
4. Profitable

I will be heartily thankful if you take your some time to give me your expert tips

Regards and thanks