It is very difficult to try to defend yourself for a crime as serious as DUI. Further, just like pilots don't generally train other people how to fly planes without attending a flight school, lawyers won't teach you how to practice law without attending a 3 uear law school and the appropriate training thereafter.
You will need to do your own research in a law library of you want to do the entire case on your own. Also, some of the forms you might need will be at the clerks office.
Look for an attorney who has a lot of experience defending DUIs. They are in the best position to present any defenses you may have. A DUI conviction stays on your record, affects your insurance rates, and costs a lot of money in the end. If you need a referral, feel free to call. I can recommend an attorney in your area who should be able to help. Initial consultations are generally free. 1-800-517-1614. Good luck.