Sure you can grow a Sativa and Indica together, they'll end up quite different heights so you may need to elevate the NL to the same canopy height as the Sativa.
I've never grown Arjans Haze, but I do know that any Hazes or Hybrids with Haze in them are not easy to grow, if this is your first time then I suggest you might want to look around for an 'easier' Sativa. Hazes are generally best left until you have more experience.
Take a look at Mandala seeds' Satori (
Mandala Seeds) which is very Sativa dominant but much easier to grow and more forgiving of mistakes.