Adding Online Store and an extra page to existing website

About me: I am a nutritional consultant and I started up my private practice last year. My website is rather small and I used a ready template which I could just fill in and upload. I have about 15 services to offer and also I have 150 self made products yet which are listed on amazon. I recently started to deal with a nutrition supplement company, aroma oil supplier, laboratory test provider etc. to list their products for drop shipping. I am looking for further drop shipping and affiliate possibilitites, but I think the volume of my store wont exceed 1000 items. About the project: -I need a web store which is matching with my site`s main page in design, which looks rather minimal and simple. -I want people to become members in order to get % off the price, but I also would like to make products availiable for non members - in case someone doesnt want to register. -I would like an editable chart that can be saved and it would be also important to accept voucher code and Membership number at check out. PayPal, Credit and Debit Cards, which I would like to accept. I need the stock list to upload easily from an inventory, like the one Amazon uses. Obviously I need to be able to send confirmations of order, receive an automated inquery form for the self listed products and an automatically forwarded order form to the companies of drop shipping. I would like to work with someone reliable and preferably interested in holistic healing. I have 1-2 projects such as this one/ year, it would be great to contact the same person if I need something. Please contact me explaining why do you think you would be the right person. Thank you. I look forward to hearing from you. Ednam