Klaviyo Promotional Email Setup

Our ecommerce brand is ready to roll out a new promotional campaign in Klaviyo, and I want the entire flow configured so it can go live without a hitch. The copy, product images, and discount codes are prepared; now I need the technical and strategic pieces in place... (Budget: $250 - $750 AUD, Jobs: A/B Testing, Branding, Email Marketing, HTML, Klaviyo, Mailchimp, Shopify Templates)