The first thins you should do before start up dye sublimation printing is to determine your target market.What material do u want to transfer printiing ?Graphic designs on mousepads or other ?Try checking out that competition in that category. See what big Asian companies are marketing mouse pads for. They are going to be your main competitors. In case you'll steer away from them and target the smaller market within decent margins, study the local competition for the said product. Be sure to know what clients are going to benefit for the product itself.
Asian market is suitable for mug sublimation printing,especiall China,to see prices and how the mugs are being sold. If you find the rate to be outrageously low, look over the local market. If it's okay with you to personally contact targeted clients in the local area, you can create your own market of clients who probably don't want to purchase loads of boxes of box, but may order a few hundred dozens. You might be able to compete in that locally targeted market.
And then you'll require a really good and dye sublimation printing machine. It would depend on the product and target market you are looking at. If for mugs or mouse pads, you'll want the smaller printer. If for large format displays like banners, you'll need a wide format printer. With that, you need to get a print press that fits the product you'll be targeting. Small dimensions for smaller items up to the large ones like trade show ad displays are available.