Can I sue?

Theoretically you can sue. But can you win? most likely it will be an uphill battle, not to mention that you damage is too little.

Can I sue the auto repair shop?

I would recommend talking to an attorney. There are too many details left out before you get an informative answer.

I need advice on suing a person in Hinesville, GA although I am in El Paso, Texas

You will have sue your defendant in his state; GA. You probably can sue him in a small claims court in the county where he lives in GA.

When being served a citation does the defendants have to sign for it?

In TX you don't have to sign for it, you are pretty much served once you have knowledge of the case, that you are being sued. The process server...

Motion for Judgment on the Pleadings granted as to one of two defendants-will there be "two" complaints in play if they amend?

No, the amended complaint will supersede the original complaint. Are you proceeding in pro se; without a lawyer? Civil procedures can be very...

You will need to present evidence to proof each and every single element of your claim. I recommend talking to a lawyer in your area.

A customer that lives outside of the United States has hired a Private Investigator (previously a lawyer) to sue me here in CA.

Contact the State bar to report an unauthorized practice of law. The P.I. has no standing to sue you and you should be able to dismiss the case. I...

Do I have a case to dispute the charge s with my credit card or do I need to pursue the debt in small claims court?

I don't think you have a valid claim against the credit card issuer. But you might sue your friend for embezzlement. After all you gave him...

Yes they have a claim against you. Talk to you homeowners insurance agent to see if you are covered under liability provision in your...

Can I sue a china apparel company for incomplete order?

You can theoretically but it would be extremely expensive and time consuming, not to mention that Chinese courts will not be too friendly to you.