Red footage and green screen

I am working on a project that was shot on Red and using RedcineX to import footage,
I have not used this program much before and am unfamiliar with the optimal settings,
There is a green screen shot in the film and I need to provide the compositor with both the green screen footage and the background footage to be composited under the green screen shot.
I want to make sure that the footage I provide him is the highest possible quality as I am assuming once it is composited there is no way to relink to the original media in the online process and it will appear as he provides it.

Can anyone please help me with which setting would be best to use when bringing in the footage through redlineX so that it is of the highest possible quality to bring into the online.

The green screen footage is quite dark, so grain is a concern and anything I can do to minimise the grain would be fantastic.

any help would be greatly appreciated!