Shopify POD Clothing Store Build

I am launching a print-on-demand clothing brand and need a Shopify storefront built from the ground up. The site has to look catchy and luxury, reflecting a premium apparel line while still loading fast and guiding shoppers smoothly from landing page to checkout.

Here is what must be in place before we go live:
• Theme selection or customisation that achieves a high-end, eye-catching aesthetic
• Seamless integration with a POD provider (Printful, Printify or similar) so products sync automatically
• Product pages with mock-ups, size guides and variant images for each garment
• Fully configured collections, menus, cart, secure payment gateways and shipping rates
• Mobile-optimised design, basic on-page SEO and the core Shopify apps required for reviews, analytics and email capture

Please walk me through your approach in a detailed project proposal—timelines, milestones, and the specific tools or themes you recommend will help me decide quickly. I will provide logos, brand colours and garment artwork once we start.