Can an alien who is convicted of aggravated felony can volunteer for deportation after the day of his release?

He can waive his right to be heard by an Immigration Judge, but that is not recommendable.

How to obtain ex-wife's proof of US citizen?

Usually it can be done through FOIA, but for that you need the person's consent. Otherwise, you may just need to file without it.

Will my juvenile record jeopardize my chances of applying for a work permit ?

Depending on how old you are now, and if you can show rehabilitation, you may still qualify for DACA. However, USCIS has discretion on these...

I was charged for theft 3 but I convicted of criminal tresspassed 2 and I was sentenced based on that

As long as you complete your probation, and can show that you have rehabilitated, you should be fine.

Immigration question.

Concerning your green card, you will need to prove good faith marriage. As for financial support, you already addressed that too, you will need a...

If i qualify for the deferred action and for an U -VISA for domestic violence. Could i apply for deferred action first?

Yes you may.

My fiance just got deported on the 18 of nov and we dont know what to do to bring him home

He will need waiverapart qualified, and retain a very experienced immigration attorney to assist him.

What supporting documents are needed for a standalone I-485 for spouse, after the I-130 is already approved?

You do not need to prove your good faith marriage, as this was already done through the I-130. For adjustment of status, you only need to prove...

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I have obtain a degree while I was working in the USA on a A2 visa, now I am back in my country can I apply for a green card?

If you are qualified, yes, you may.

Can I enter the US with a b1/b2 visa while already married to a US citizen? (he's an expat in my country, no plans to immigrate)

The answer is that you can can do everything you mentioned above legally, as none will be an immigration violation.