I received a lot of helpful info from this thread so I wanted to come back and share the wealth a little. My first two designs came in...
[/url][/IMG]
I plan to do maybe 15-20 more designs throughout the year, then possibly get into other types of clothing (jeans, designer shirts, sweaters, etc).
I used Gildan Ultra 2000 t shirts. They're high quality, the designs look good on them and they can survive multiple washes. If you order in quantities of 100+ you can get finished shirts to your door for between $5-$7/shirt depending on the design and how many colors it has.
Designs on the t shirts usually max out in size at 12"(width)x15"(height), but some printers can go bigger for an extra fee.
I really recommend the fulfillment services if you have ideas for t shirt designs but don't feel like doing all the legwork.