How would I go about this? What documents would be needed? Is this possible?

Your post is not clear. What is your status? Where are you now as you say you live in the Caribbean but your post says Va Beach.

It is not a requirement for DACA purposes.

I would guess your apartment is not like a tree house in your parent's back yard, but where you actually live. However you can provide both...

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When i file immigrant visa petition for sister , she was single , now she is maried , i should retain her name in visa aplicati

You tell the truth and use whatever her name is now that she is married.

Can he apply for citizenship? Are there any risks?

An aggravated felony is always risky. Your best option is to sit with an immigration attorney and talk this over.

Is there anything I can do if my DACA app was denied.

It is a basic requirement to prove you are in school. I have filed religious based high school proof many times, why are you not able to do the same?

Can he apply by himself? Which be the best way to have him become an American citizen?

Your question is very confusing but I am going to respond based on what I think you mean. Unless he already has a green card for 5 years, he cannot...

Are there any specific clauses that need to be added to a prenuptial agreement because I'm a UK resident?

This is not an immigration question so I have redirected it to family law forum.

The officer gave me a receipt stating allow 30 days for a response at info pass after asking about my pending application

It is possible that they will get back to you, I have had that happen for clients of mine, but don't hold your breath. Contact them.

Obviously if you only lived with your parents during holidays that is not your residence. Use your school address.