Retail Fraud / Shoplifting: Recent Graduate Caught Shoplifting

My question involves criminal law for the state of: Georgia

So I stole $30 worth of stuff from WalMart. I am almost 26 and literally the only other 'charge' I have gotten was a single speeding ticket a few months ago.
The story:

I was stopped by a younger lady and middle aged man, who took me into the room where all the security cameras were. They told me to take out everything I stole. Considering I was petrified, I did as they asked. They asked me if this my first time caught shoplifting. I said yes. Then they asked if this was my regular WalMart and I responded that I never really go to Walmart and this was my first time going to this location.

The man asked for my ID, and I gave him my license. I just graduated from grad school, so I still have an out of state license. He asked if all the information on there was correct, I said yes, then he asked for my local address, which i gave, asked for my SS# and I asked if they really needed that. He said no, but it does make things easier for him to find me in the system and that my information will not be shared with anyone. I thought well I should make everything as easy as possible for him, and since I have no record, I cooperated and gave it to him. He then explained that what I did was a misdemeanor and I could be going to jail.

He explained the procedure with the bail and bail bondsman. He then said if you shoplift at any walmart again, you will be prohibited from entering any walmart/sams club establishment. After a bit of just waiting around, he tells me that they are backed up at the court house and don't have any available officers to come pick me up. He said this was a better situation for me and i wont have to pay any fine today, but may so at court. He told me that I will be receiving a letter in the mail with a court date on it and he couldn't stress enough about going to it.

He then said I was free to go, but i just sat there probably looking like a deer in headlights. He gave me a puzzled look and I asked if he could please just explain everything to me again since I have no prior experience in this in any way. He picked up a piece of paper and said ill be getting a notice like this (he was across the room about 10ft away so i couldnt actually see it) and that i go to the courthouse on the day and time specified on the letter. He also explained that there will be a bunch of other people in the courthouse as well, including him. And going basically means I am turning myself in, and I won't have any jail time, but there will be some sort of fine but he did not know at what amount it would be. Then he told me i could go again, so I did.

I never signed any paperwork nor filled anything out. The only thing I signed was a refund of purchase receipt for an item that was charged less than it actually was on sale for.

This only happened a couple days ago, and i was told that it would take a few weeks for the notice to arrive in the mail, so I have not received anything yet. I am just wondering what can I expect along the lines of this being in my record. I am just starting an internship, and a friend told me that it wouldn't show up in a background check until I go to court. I start my internship on the 20th.

I just need some guidance from someone who is familiar with this subject/has experienced a similar situation. I am kinda freaking out and plan on going to a consultation with a lawyer, but I also wanted to see if I could get some help on here about what may happen and maybe some advice on talking to a lawyer (since I have never done that before)

That you so much for your time in reading this, and I appreciate any and all help I can get.