I would like to hire a Sourcing Buyer

Hello, I am looking for someone to pen that initial email to selected designers and fashion brands. Essentially we are a start-up in the process of launching an e-commerce platform. We would like to invite particular designers and brands to sign up with us so the initial contact is crucial in initiating and preserving a relationship that will be very profitable to both sides. I would like someone who has experience in approaching mid luxury and independent brands to showcase their designs and sign up for what is an SAAS business model. It will be necessary to secure their catalog in order to predict shipping and customs costs. It will also be necessary to know their ERP management information system as we would need to integrate areas such as planning, purchasing, inventory, sales, marketing and finance. I want someone to put together those first two emails, the introduction which will promote our offering and USP's and the reason we would like to work with them. An email of flattering professionalism. Experience with brands like Y Project, Alice & Olivia, Red Valentino, Marella etc is useful. I look forward to hearing from you.