Informational Service Site Build

I need a simple services website whose sole purpose is to provide clear, well-structured information about what I do. No e-commerce, no blogging features—just an intuitive, professional site that presents my services, background, and a straightforward way for visitors to get in touch or request more details.

Here is what matters to me:
• Clean, classic design that is fully responsive
• Fast loading pages and SEO-friendly setup
• Simple navigation with sections for Home, About/Services, Testimonials, and Contact
• A contact form that routes enquiries to my email
• A basic CMS or builder (WordPress, Webflow, or similar) so I can update text and images on my own later

Once the site is live, I’ll need a quick walkthrough of how to edit content. Please let me know which platform you recommend, how long the build will take, and any examples of similar informational sites you’ve done.