I think so... but of course you need to read surah el fatha first :)
I'm not sure...
I think you can read it in the second rakaat (I'm sure about that).

I want someone who is well versed in Islamic studies to clarify me on this:

As surah Nas is the last verse of the Quran it is not recommended to read it in the 1st rakaat. If it has been read in the 1st rakaat, then the same surah should be read in the 2nd rakaat.

Anyone please advise..
Jazaak Allah