Writing content for a new beauty clinic website

Our clinic website content is currently empty or has generic text placeholders which need to be rewritten. There are about 15-20 pages in total describing our clinic, treatments, blog and some general info. Ideally, we'd want someone with the right background to update the content with SEO in mind and adapt a quirky and personal tone throughout the site which would appeal to our customers. Please respond with your pricing, either per word or based on any other metrics.
Thank you!