Iron on transfer "paper" is available that you can use for what you describe. It's getting a little more difficult to find but you should be able to find one.
- You can typically find the iron-on printing paper at any local craft store.
- Another Solution: Visit Zazzle.com and pick out the t-shirt of your choice, then use their site to type the text, select the font, and place it onto the shirt. They'll print it and deliver it to you. Prices are very reasonable.