I want you to review Threadless's site on submitting a design. https://www.threadless.com/make/submit/
You will need to read Threadless.com Community guidelines and Terms of Use section 8. Copyright Infringement found at https://www.threadless.com/info/terms. Next read Design Challenge Submission Legal Terms and Conditions sections 1-6 found at https://www.threadless.com/threadless/legal/.
You will need to read 2 articles. The first on is Is There A Survival Guide To Threadless Design which you can find at: http://ask.metafilter.com/188743/Is-there-a-survival-guide-to-Threadless-design. Please make sure to read through the comments because you will have to answer some questions about this before you can do your design. Next you will read the article about the founder of Threadless, Jake Nickell, in Chicago Magazine. The title is How Jake Nickell Built His Threadless Empire and follow the link: http://www.chicagomag.com/Chicago-Magazine/July-2012/How-Jake-Nickell-Built-His-Threadless-Empire/
