AlternativePhotography.com is a good place to start:
http://www.alternativephotography.com/wp/processes/liquid-emulsion/the-modern-tintype-process
This book is also wonderful, as it covers many different processes, but it's way too expensive on Amazon:
http://www.amazon.ca/The-Book-Alternative-Photographic-Processes/dp/1418073725
But yeah, using Pictorico (or the inkjet negative of your choice) it is entirely possible to produce Tintypes at home from a digital file in your (well ventilated!) darkroom. Its a great way to learn this process. If you're pouring the solution yourself, you'll need to practice a couple of times before you get an even pour. There are videos up on Youtube that will also teach you what you need to know.