I need a professional website design you can sell products on

I need a professional-looking website that will help me get in the door with big suppliers. The site must be clean and professional, it must have a good 'contact us' form, FAQ page and an about us page. We will be selling products from a range of categories on the website so if there is a way of making it so that we can easily add/ remove products to different categories that would be great as well. We have already bought the domain 'shopdreams.co.uk' and started trying on WordPress but it's very complicated and we need to website up and running ASAP. We will give much more detail including social media, logo, about us page etc. once we have found someone for the job. For someone who is experienced, it really shouldn't take long.