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I'm sorry to hear about your situation. There are two cases that you could have in this breach of contract situation. One is for the monetary value of the items that you put into the business, and the other would be an "injunction" (a legal court order) to return the property that you contributed to the business. Now depending on the value of the materials, it's something that you might be able to bring in small claims court, but only for the monetary value of the items. If you wanted to sue for the return of the items, you'd have to bring it in a court that has injunctive authority, and that's a court of general jurisdiction. Such a court would require a higher level of pleading, procedure, evidence, etc... That being said, you need to contact an attorney in your area that deals with breach of contract cases. Go to www.lawyers.com or www.legalmatch.com to find an attorney in your area. You should be able to find one that will give you a free initial consultation and better advise you of your rights, any problems with your case, likelihood of success, how courts are treating cases such as yours in your area, and what you should do next.
Hope that clears things up a bit. If you have any other questions, please let me know. If not, and you have not yet, please rate my answer AND press the "submit" button, if applicable.
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Thank you, ***** ***** luck to you!