I need a shopify developer

I would like to create a website for my small business. I want to sell custom t-shirts and tumblers. I want the t-shirts to be mystery shirts. I want to let the customer pick their shirt color and size, but I want to have categories they can select of things they are interested in so I can pick a design that they would like to press on the shirt. The t-shirts would have sizes S-4X.The tumblers have designs that I have already made and I would like to start by listing those. I would like to be able to add more tumbler designs later.