1) The director is more likely to say "Alright!", "Perfect!", or "Excellent!". I guess there are many other words or phrases you can use, but I think these are the most common ones.

2) Again, you can say this in many other phrases, but most practical term would be "Roll the film."
But in real life, they must do many takes in order for movie to become perfect. If I were the director, I would get tired saying "Roll the film." every time after the take is filmed. Every staff should know what they should do next, so it would be more practical to just say nothing and wait for them to roll the film for you.