Plastisol transfers are screen printed. So basically you would need a full screen printing setup (and then lean the ins and outs of screen printing to figure out how to do it right).
http://www.t-shirtforums.com/tags/sc...ing-equipment/
If you are just printing for yourself and buying the screen printing equipment, you might as well just skip the paper part and just print directly on the t-shirt.
Here's a quick tutorial on how to print them once you have the equipment:
How to Make your own Plastisol Transfers
Equipment to make Plastisol Transfers? Which companies 
