It means that the USCIS officer is reviewing everything you sent.

If you are a US citizen, you can file a petition for him to immigrate and he can file to adjust his status to that of a lawful permanent resident.

Sounds like it's approved. If the posting is correct it means they are sending you a green card.

If you are asking whether you are authorized to work, without a work permit, no. The fact that you are working as an independent contractor, and...

She should not need to request them in person. Contact the official who has the documents and find out what needs to be done to get them.

We have no information what your case is. Nor who refused it.

They might. But more likely this is for alien labor certification, for an immigrant visa.

If you don't wish to be liable for the I-864 affidavit of support, you should notify the embassy not to issue the visa.

Try getting a post office box so you can receive your mail.

If it's approved, then you are an H1b. If you wish to leave the country and get the visa issued abroad, expect big problems. Problems may depend...