I love it! I really like the name. I use 10 out of the 11. Will there be graphics on the shirts? I think mugs are a great addition.
Testing the waters is a great idea. Cafe Press sounds ideal for you just starting out. I agree with sending out a press release, you'll need to create buzz. Maybe once your store is up and running put together a brochure that you can leave at various places in your local area with your store information on it. Mail it out to family and friends encouranging them to pass it on. Have a few shirts on hand if time permits check out your local flea markets. People are always look for unique finds there.

Keep us posted and good luck!