It's unclear what you are asking. Please rephrase.

I539 denied and i94 expired.

Yes, your out of status period is considered an overstay. Depending upon the length of the overstay, it could bar you from re-entering the US for...

Will I honestly need a lawyer at this point ?

It sounds like a moderately messy situation. It might make sense to run this by an attorney, as this is a complicated matter.

What is the emergency advanced parole and how can I obtain it?

You can apply for advanced parole and request it be expedited.

What happens when a green card holder was convicted of a DUI and marry a US citizen person? Will u still wait for 5yrs to apply?

You should probably wait five years to insure your best chance of success.

Simple overstays with a criminal conviction generally aren't the focus of ICE. However, it is unquestionable that you will run a greater risk of...

it's a minor infraction but repeated violations like this can be used by the USCIS to show that you lack the moral character to become a citizen....

Your previous green card has expired. You will have to file for a new one. It's not clear whether you qualify based on the evidence provided.

What is the next step after the uscis approve my waiver request?

Uou can go ahead and apply to adjust status or whatever you were planning on doing. The 2 year bar is removed.

Approval notice for I130 petition was returned by the post office, what will happen next?

You can check your status online using your receipt number. I'm not exactly what significance having the letter returned is.