Try the sites below. The last site is the most affordable way to get access to an Attorney/Law Firm in your state. Watch the online movie presentation. If you like what you see, please contact me.
Try contacting the Oklahoma City University School of Law. They may have a legal clinic that can provide you with free or low cost counseling or be able to refer you to an organization that may be able to do so. If the judgment and garnishment started recently you can try to appeal the garnishment. The garnishment notice should have instructions outlining the appeals process. There is usually a limited time in which you can file an appeal so you need to act as quickly as possible,
While it is preferable to have the assistance of an attorney, if you cannot retain one, you may also check to see if the applicable court with which you file the appeal has a pro se clerk to help you, but pro se clerks cannot provide legal advice. They can only help you with questions regarding procedures to file your appeal.
Generally speaking, to prevail on an appeal you will need to show that the garnishment amount will prevent you from meeting basic needs (e.g. food, shelter, healthcare etc.) You'll need to collect documentation showing your bare necessity monthly expenses and your monthly income.
It sounds like the creditor is a collection agency. For the new claim you need to contact them immediately and you need to file an answer to the summons. Again, this is something for which you would be best served by having an attorney represent you, but even without an attorney you may be able to find out what the nature of the claim is and, if you believe it is valid, to work out a out of court settlement and terms of payment. While it's probably of little comfort to you, if you end up getting another judgment against you and your current garnishment is 25% of your weekly income, you cannot be further garnished as Oklahoma follows federal law regarding income exemptions from wage garnishment.