Is legal to run u.s firm from outside of country without valid visa?

You need a US corporate lawyer. You should probably set up a C corporation - the corporation will pay the taxes for the corporation itself. For...

Will LPR of the derivative beneficiaries be jeopardized if the principal applicant is refused to re-entry US after long travel?

This is an immigration question. pass to that area.

Is it possible to bring my Iranian fiance to the US on a fiance visa?

This is an immigration question. Pass to that area.

Can an F-1 Student sell on amazon?

This is an immigration question. Pass to that area.

Will the new public charge rule affect my visa?

This is an immigration question. Pass to that area.

How do I get all criminal records and court dispositions in NYC? ?

This is a criminal law question. Contact a criminal law lawyer and ask.

How do I get my brother back in the USA and he owes over $20,000 in child support?

It may be easier and cheaper to just pay the back child support.

How can a foreign national with a Startup in his country of origin set up his Startup in America(preferably Florida)?

You need to hire a Florida (or whatever state) business lawyer -preferably one with international experience- to help you set up

This is an immigration question. Pass to that area.

I have a possession class II 2 felony charge. Can I still travel outside the US

You should ask your probation officer if you can travel ,outside of the country -or anywhere at all, for that matter- and you should contact the...