How can I make a plea deal?

Yes get a lawyer to help you. This is best since most people have no idea what they are doing in court. You can represent yourself. You can also take out your own appendix with a knife. Both are equally smart moves.

I can almost all but guarantee you that you will not be able to get a favorable plea deal, or at least the kind you want, on your own. You will need the experienced of an attorney with substantial experience in DUI defense. There are a lot of variables that factor into a DUI case starting with the legality of the stop, the administering of filed sobriety tests, the maintenance records and calibration logs for the evidential breath machine, the certification and personnel file of the officer, were all the administrative rules followed, etc. Prosecutors are also under a lot of political pressure to be tough on drunk driving even first offenders. Many have policies against reducing the charge or against reducing the charge to a non-alcohol related offense. Prosecutors will not do that either, unless they have to. Only an experienced DUI attorney will know exactly what to look for and any deficiency, problem, or defense can be used as leverage in plea negotiations. If you cannot afford to hire your own attorney, ask the court to appoint you one.

You need to hire a DUI specialist. A DUI has far-reaching consequences, and most people don't know until they come crashing down on you, one by one, a few months after conviction You probably already lost the DMV portion by not even requesting a hearing.

Ask the Judge for an appointed lawyer.

Hire an attorney.