You do not need to spend money on a website before you’ve validated demand (Modules 1–4). Genuinely free/near-free starting points:

• WhatsApp Business + Instagram Shopping catalog — both free, and sufficient for your first 10–50 sales while you’re proving the product works.
• Shopify’s free trial or a WooCommerce store on low-cost shared hosting — once you’re ready for a real storefront but still want to keep costs minimal (often under $10–$30/month total).

A common, sound progression: sell your first 10–20 units through a free catalog, use that real sales data to refine your offer, then invest in a proper store — rather than spending on a polished website for a product nobody has bought yet.