If a probation officer resigns, is the agreement he signed with the person on probation still valid?

Yes. This contract is still valid, and enforceable.

I received a background check that stated I had a warrant in GA for failure to appear and want to know how to resolve this?

Yes. Hire a local attorney to handle this matter for you. You are most likely facing a fine plus a $100 penalty for missing court.

I stay in ga an I'm charged with sales of marijuana x2 the DA is offering me 10 do 12 an i'll do like 6 months how do I stay out

You need to hire the best lawyer you can afford.

I served 5 years in prison and 18 months on probation. After I serve a total of 5 years on probation could I get off

Possibly. However, you usually have to serve about half of your probation time.

People can sit in jail for days, weeks, or even months waiting to see a judge for probation revocation issues. Hiring a lawyer will get him in...

If a person is on unsupervised probation on a first offender offense can that person obtain a drivers license

Please see my answer to your other post.

If a person is on unsupervised probation on a first offender offense can that person obtain a drivers license

He should be able to get a driver's license in whichever state he resides.

Why did the judge deny him bond? He is a college student and parents are vouching for him.

He demonstrated that he cannot abide by the conditions of his first bond by getting arrested again on similar, but more serious, charges.

Called into office advising I was shoplifting a shirt. I said you are correct and once I got home, I remembered I forgot to pay.

I wouldn't worry about it. If you weren't cited or arrested while you were there nothing is going to happen. You may get a civil demand letter...

What is the best way to get charges removed from court records?

You need to file a motion to seal the court records.