Yes, you can own .. but not work there NOR be involved with management ... NOR make any hiring decisions ... which will be a potential...

No, PERM sponsorship by a non-profit will not be faster.

No, the I-539 isn't needed ... which the employer's lawyer should know and be able to verify if you talk to him/her.

Protected from what? Please explain your concern.

I agree with Mr. Smith .... hire a new attorney.

Yes, you can do the LLC paperwork ... but not work.

Not an immigration question ... talk to a criminal defense attorney.

If the O-1 changes employers, it isn't necessary to file a new O-3.

Can approval of I-130 expire?

Although it is probably too late ... talk to an attorney.

Can I petition my brother and his family who is currently in Canada to live with us here in the US?

Depending on their nationality, it will take 10-22 years for you to sponsor them ... AFTER you become a US Citizen.