For you dye sublimation you will need: Epson printer, dye sub inks and dye sub transfer papers (preferrably high release for fabrics).
Shirts must have high polyester content, the more the better. Dye sub inks cannot dye organic fibers such as cotton. There are many new poly shirts on the market that are geared toward the athletic market.
Your transfer graphic will be superb. There will be absolutely no "hand" or feel to the graphic as nothing is transfered to the fabric. It will have outstanding wash characteristics and will never crack, peel or fade.
Be aware there are no "white" inks for dye sublimation. Any white area in your graphic will be the color of the fabric you are transfering to. Unfortunately, this limits us from printing on dark shrits.
There are many suppliers for supplies and blanks. Do visit the www.dyesub.org
site to learn more.