There is a VERY VERY good reason to use Green screen, and one of the correct Chroma green color. Most codecs compress the red and blue channels so your data in those channels will be far less usable when it comes to extracting a good key, where as all codecs leave the green channel as humans have more receptors in line with green (comes from evolution and avoiding things in jungles and plants).
Lighting is going to be a huge factor, not only the quality of lighting on the screen and keeping it as even as possible, but also lighting your subjects to be able to match them to the scene lighting they are being composited into. To avoid major green spill you will want to keep the subjects a decent distance from the screen so unless you are sticking to medium/tight shots that screen will not be big enough for much movement while dancing.
There are any number of lights that would work to light the screen, but in general you want to set up lights so they are soft and even using diffusion or some kind of soft modifier, and try to avoid hitting the actors or casting shadows onto the screen.
There are literally hundreds of tutorial videos and articles about lighting green screens, I suggest starting there.
RE: Backlight from the post above, rim lighting is actually very useful for green screen work to help counter any spill and sepparate the actor from the screen. This of course also needs to match the scene you are trying to composite into.
Are you shooting the plate of the first dancers not on green? If so you will have a lot more control and info to match the lighting and framing. (lens focal distance and stops are important too so the perspective matches)