You needed a lawyer on August 9th. If you cannot afford one, request a public defender, and do so before your next court date. Otherwise, you will have to figure out how to hire a lawyer before next week so you can avoid drawing the ire of the judge.
Possibly. It would be up to Hall County to decide whether they want to spend the money on extraditing you. Knowing how serious Hall County treats DUIs, I would say it is likely. Not to mention you would have a bondsman after you. In any event, why would you want this hanging over your head the rest of your life? You need to deal with this. The case will not go away just because you disappear. DUIs can be contested in many, many ways. You may have a good defense. Don't make a rash...
Most courts will permit waivers of arraignment which, if done in advance, means neither the defendant nor the attorney needs to show up. This is something you should ask your lawyer about, because it depends on the jurisdiction and the judge. If you don't have an attorney, you need to appear at the arraignment and request for a continuance to give you time to hire a lawyer or request a public defender. Hopefully you have an attorney at this point. If not, hire one immediately.
Before you get your probation revoked, file a motion asking the Judge to let you work off your fines by performing additional community service. The Judge has the authority to do this. This will be hard to do on your own. Ask the attorney that represented you about this. Otherwise, sometimes probation officers will point you in the right direction. In the meantime, report to probation every time you are told to and make your best efforts at paying this off.
Hire a lawyer immediately. There are many ways to challenge a DUI charge, and many lawyers experienced in investigating those issues. Call a few lawyers. Most, including myself, will give you a free consultation.