E-Commerce site

I would like an online store to be designed that i can do my daily business by selling natural grocery products directly from. I would like a modern contemporary site. It must have a postage calculator that automatically adds up the total weight of each product put in the basket. At the end this total weight will then automatically show the customer the postage options available to them for the weight of there purchase. I will need a key code symboling system to be implemented. this will be so as each product on the site can be identified to have certain dietary elements with the consumer having the click on the item to see. This will enable the consumer to visually identify certain products whilst browsing a full product page of products. It will allow them to see that certain ingredients are not in the product without have to click onto individual products. I will need functions such as sort listing systems as well as different categories. i will need a payment facility added, business email addresses and about 3-5 pages including the main page for info. I will also need around 100-200 products to be added. I do not have a logo so i may need special fonts for my business name which can double up as my trade mark for now. I will need product pictures edited and added to the site regularly once the site is built. the theme of my site should be natural as in natural foods so i need the feel of nature in a contemporary way.