Mobile-Friendly Builder Website Setup

I want a modern, clean website that presents my small building company—focused on renovations and repairs—clearly on any phone, tablet, or desktop. The site should include three straightforward sections: About Us, Services, and Contact Us.

Here is the full scope I need you to cover:
• Design and build a responsive one-page (or light multi-page) site that follows the modern-clean look and highlights our renovations & repairs expertise.
• Connect and launch the finished site on my existing domain, handling hosting configuration, DNS updates, SSL, and anything else required for a smooth go-live.
• Generate a QR / bar code that points directly to the homepage and supply it in both PNG and SVG so I can use it on flyers, vans, and invoices.
• Create a small set of Gmail accounts (e.g., info@…, quotes@…) and walk me through how to access and manage them.

Because I’m not a web professional, I also need clear guidance while you work: brief explanations of each decision, short Loom videos or screenshots when relevant, and a simple hand-off document so I can update basic text or photos later.

Please share examples of mobile-friendly sites you have launched, outline the tools you prefer (WordPress, Webflow, or coded-from-scratch—all fine as long as upkeep is easy), and confirm your timeline for design, revisions, and launch.