Path to US Citizenship

It is time to see an attorney. Normally, one would have to become a permanent resident first, and then apply for citizenship.

Will I be able to get a green card

There might be an issue depending on his conviction.

At the interview, your friend was given a photo to sign. That would be his signature printed on his certificate of naturalization. In the US, there...

U.S visa validy

You will have to start the process again, applying for a new I 20, visa, etc. It is not possible to reinstate status in your situation.

Can you apply for transit and visitor visa simultaneously?

One can apply for different visa, but will be admitted in only one status.

What kind of visa can I get if I establish a LLC company in USA?

You might be able to qualify for an L visa, or even a parole (new program that was announced) for entrepreneurs. Children under 21 and your spouse...

Can an employed F-1 student on post completion OPT become an Amway IBO?

I would say yes. But it depends on the degree of your involvement.

Are there any paths to living in the US legally for someone who has previously been deported?

Some waivers might help. You need to meet with an attorney. Many would provide consultations via Skype.

My friend was cought trafficking people from tijuana to the United States know they have her and 2 others in mcc san diego wha

Sounds like possible aggravated felony chargers... a good criminal defense attorney might help.

Is the following statement an admission of fact?

You should really see an attorney in person.