Equipments needed for Digital Printing

Hi Sir/Mdm,

I will like to setup a small size Tshirt printing service to provide customized printing service. What are the equipments needed other than a PC, Printer & Heat press.

I like to print the design using inkjet printer. What type of transfer paper do I need?

I have a image with has numbers "123" inside a box with a transparent background created in photoshop, when I print using the inkjet transfer paper and transfer using the heat press,
A. will it be transfer with just the numbers "123" onto the Tshirt
OR
B. it will transferred with the numbers "123" with a layer of plastic with the transparent background.

Is the output dependent on the type of paper use? WHat paper should I be looking for?

Rgds
Simply1010