Create a shopify website for my existing website.

I have a website I own and am looking to switch to shopify hosting. I am looking for the website to use one of their base templates but be updated to work for my website and updated with my images. You can see my existing website at www.Accountwarehouse.com. The website will need to SEO optimized and function the same for the sell pages where sellers can submit a quote. The buy pages and actual product listings can be changed to fit the shopify theme as I am not opposed to updating the design to be more modern.