Complete DS160 and submit conformation page.

Not recommended without approved I131, Risk of I485 abandonment and denial.

There may be issues to be resolved before decision.

You will need USCIS authorization to work for an NGO for free.

You may renter US with Advance Parole when H1B is rejected.

No, the 1 year deadline is no longer required.

Your questions are technical and requires an immigration attorney assistance to answer them.

. Yes, an H1B can be transferred to get another employer to sponsor you without having to travel to the US.

An aggressive follow up, preferably with an attorney is recommended.

It is permissible to file two parallel or independent applications for immigration benefits,