Julie,
Why just a mockup, I can build a professional looking website in 2-3 days for 135 GBP and will give you a video that would make it easier for you to administer the site with ease and I will integrate a drag and drop visual builder that allows you to manage the pages, content,media, design, colors, fonts and many other sections with ease without any coding or design knowledge or background, if you are interested in possibly hiring me, get in touch and I can show you a couple of my recent works
Regards,
CL