You need an attorney that deals with employment law. Do you have anything to prove the hours that you worked or the wage you were to be paid? Did you fill out tax forms when you started working there? Collect any documents that you have related to the employment/employer and search for employment attorneys in the county/state that the employer is located. You will most likely have to sue him in federal court and there are big penalties that can be awarded, but you have an uphill battle to prove what you are owed.
While I agree with the previous answer, indicating that you need to contact an employment attorney, I would disagree with the idea that your case is a federal one. Indiana has very specific wage/employment laws, which require employers to pay their employees at specific intervals. In addition, if you were hired as an hourly employee (not one exempt from overtime pay), it is likely your employer has violated state law by not paying you for your overtime. Depending on the specific facts of your case, you may have many different viable claims. I would suggest you contact a local employment law attorney. There are multiple Indiana laws which provide for liquidated damages, relating to unpaid wages, which double or triple your recovery if you are successful at trial. As a result, most well informed employers will settle these claims rather easily, if they are at all in the wrong.
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