Pricing Shopify website creation for clients

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Hello, a new shopify web designer here! Can anyone please assist me to offer quotations for new shopify website clients? I need to determine what features of Shopify they'll need me to set up for them and how they’ll need configuring, depends on their products and business model. I need a template of sorts for them to fill out with clear explanation of how their supply chain and fulfilment will be managed so I can accurately price their website creation. If anyone has a template they use for this info gathering process or a resource they'd be willing to share with me, I'd be very appreciative.