What is my probation officer comparing my urine to to decide that it is indeed diluted

The test itself usually indicates if the test has been diluted.

How do I get a request form to get my discovery?

There isn't a request form. You must file for discovery. Use Google to find some discovery forms in Georgia.

They will most likely issue a warrant for your arrest.

What to do if your pre-trial diversion community service hours were not accepted?

Go ahead, and do your community service again somewhere else.

Is it possible to request a bond hearing now with the superior court to try getting him out before Christmas?

A lawyer can file a motion for bond, but it may not be heard before Christmas. Getting a date before Christmas is going to be difficult.

Is there any way I can lessen my sentence? Is there any way I can get this expunged from my record?

Unless you were arrested, and fingerprinted at the jail, there is nothing to expunge. If you were only given citations you need to get them reduced...

Can a lawyer help this situation or its a loss.

More facts need to be known before your question may be properly answered.

How can I go back to Walmart after signing paper not to after being arrested for shoplifting

You can't go back. Wal-Mart has security that rivals casinos. You stand a good chance of being caught if you go there.

If he feels that his lawyer didn't have his best interest in mind is it too late to ask for time to hire a new lawyer?

He needs to retain a new lawyer to file a motion to withdraw his plea.

What is the likely out come having to go to state court for this? What can I do to help myself in this situation?

Since this is your first offense you should qualify for a diversion program which, upon successful completion, will dismiss the charge against you...