Sales-Focused Shopify Email Marketing

I run a Shopify store and I’m ready to push sales through email marketing. Right now I don’t have a subscriber list, so the first step will be to capture qualified addresses—pop-ups, exit-intent offers, and any creative lead-magnet ideas you recommend are welcome... (Budget: $250 - $750 USD, Jobs: eBay, Email Campaign, Email Marketing, HTML, Internet Marketing, JavaScript, Klaviyo, SEO, Shopify, Website Design)