You should hire a lawyer. These are serious charges, especially if you only have a learner's permit.
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If they were going to charge you with fleeing and eluding, they would have done so. But if you received a citation only for illegal u-turn, I think you are safe from additional charges.
The thing to worry about is that the charge occurred while you were driving on a restricted / limited permit. You need to make sure that this ticket will not snowball into an additional suspension for violation of a permit. You don't want to resolve the case before your license is fully reinstated. For that reason, give me or some other attorney a call to keep things right for you.
You can contact me at my office at 770-744-4211 or by email through this website. The questioner and any reader do not have an attorney-client relationship formed by our communications on this website. Advice given by me on this website is general advice based on partial information. You should not rely on any advice given without first hiring a lawyer in the area where the case is pending, and providing that lawyer with full information.
The other attorneys above are correct. You should get in touch with a local lawyer to help you out with this. While an illegal u-turn may not sound that serious, it could have major ramifications for your license. Get in touch with an attorney who is practices regularly in Duluth Municipal and Gwinnett State Court to help negotiate your case.