Check out threadless.There are a variety of ways to get started in the business. First, you need to figure out how you wish to print your t-shirts. There is an inexpensive and cheap way to print quality t-shirts from home, without breaking the bank. It includes the use of a t-shirt heat press machine and custom screen printed heat transfers... You can see this machine in action by going here:
http://tshirtriches.com/video-more-faqs-about-starting-a-t-shirt-business-with-a-heat-transfer-press-machine/
Regarding trademarks... these guys have a free interview on their site with a trademark attorney as it relates to the t-shirt business:
http://tshirtriches.com/interview-trademark-copyright-tshirts/
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