My wordpress website upgrading and becoming functional for ecommerce

General information for the website: Retail of Sports equipment
Kind of development: Customization of existing website
Num. of web pages/modules: 6-8
Description of every page/module: Home Page (about the company) Products which will then expand into each type of product (gloves / pads / shin guards / hand wraps) , then as you click into each product type it will open out into all products available in a small icon format with price underneath, then when you click on the product it takes you to a page with description etc. Then the ability to choose size of glove and add it to basket.
Description of requirements/features: Click each product to be abe to go to full page with description, then option to choose size and it shows stock level also.
Extra services needed: Customization, Optimization
Similar urls: www.thaiboxingstore.co.uk
Extra notes: HI there, I have recently incorporated my own business, TKM Sports Ltd which will retail sports equipment, mainly gloves, shin guards and pads etc. I have a website already, so the domain etc is already in place, I want the website taking to the nect level, products adding in and becoming functional to the point of searching and adding to basket etc, I have certain websites in mind which provide what I want to achieve with regards to product search and choice. I aim to accept both card (so world pay for instance) and paypal and would like it to show stock levels etc so customers are not let down, I would like to be able to maintain stock levels behind the scenes.