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If the case is in a small claims court or a state court, you can get forms on line. If it is a federal claim, you really need an attorney because procedural mistakes can hurt you.
You really should not attempt this without hiring an attorney. Depending on the type of claim, there are numerous pitfalls which you will likely not be aware of and could waive off on critical rights. You are only asking for further trouble if you attempt to do this yourself. It is well worth the investment to find legal counsel to assist you. If you qualify and are financally inable to pay for an attorney, you might also be able to get free legal aid.