Upgrade and customise my Zencarts shop.

Good afternoon Freelancers, I have a web site which has a Zen Carts shop that sits behind it and takes orders. The visitor browses the web site and when they click the ‘visit our shop’ button they get redirected to the Zen Carts shop which they can then use to purchase the product. I have recently completely overhauled the look and feel of the web site and now need the Zen Carts shop worked on. I want a number of things: 1). I need the Zen Carts shop upgraded to the latest version. 2). I need the Zen Carts shop upgraded to look as similar to my web site as is possible. As seemless as possible. 3). I want it made more simple. At the moment people have to enter a username and password, I don’t really want this to happen. I would like them to add items to the basket, then click on checkout, then to enter their details and click pay. Nice and simple if it’s possible. At the moment it asks way too many questions. The kind of person I want to hire will have good English communication skills and to be able to test and support their work. I look forward to hearing back from interested parties. My kindest regards Richard, England, UK