ECommerce web design for equestrian online store

I would like a clean looking ecommerce store which will sell equestrian clothing, accessories and grooming products. There will be approximately 6/7 pages (1 page per category) and I would like to be able to manage the inventory/ upload new products if possible. I am not very computer savvy so the site needs to be as user friendly as possible!

I would like a white back ground and clean, fresh look to the store. I would also like the site to feature an 'about us' page. I already have a company logo which I have attached to this spec. The categories I would like on the page would be jodhpurs, boots, jackets, tops, riding equipment, grooming equipment and 'about us'. I would also like a 'contact us' part where people can send a enquiries. I doubt I have covered everything here but hopefully this gives an idea of what I'm looking for...

Thanks for reading, please contact me if you have any questions.

Becky