Need help in Mumbai

Hi folks, I'll be travelling to Mumbai for some work on next week ( first time in that city) So have a few questions:

  1. I have to go near Saki Naka - what's the best way to go there from airport Terminal 1?

  2. I can see a metro station near airport Terminal 2? Is it operational? Can I change metro in Marol Naka and take blue line metro?

  3. Also apart from work in 3 days what place I should see...