Shopify ecommerce store for Print on Demand Print Shop

I am looking to have a Shopify ecommerce store built for my existing print on demand print shop. I selected that this project is for an existing business, and I do not need any additional features such as payment processing, inventory tracking or customer management, just the basics. I am interested in maybe adding a few special features such as upselling at checkout, special pricing for members or a customer loyalty program - depending on cost. I am looking for a freelancer to provide high quality work on this project. We have an exisitng website now that sells Flags (state flags, national flags, etc) as well as some home decor type products. We would like to add pricing calculators to our site based on square foot pricing for our stocked substrates. We do large format print work for Consumers, Businesses and Resellers. These customer categories would have their own pricing tiers