This is a collection of articles to improve your green-screen (chroma-key) keys, for both Apple Final Cut Pro X or Adobe Premiere Pro CC. There are two choices here:
Pick the version that appeals to you.
Thoughts on Improving Green Screen Results
FCP X: Create a Basic Green-Screen Key (video)
FCP X: Create a 2-Color Chroma-key (video)
FCP X: Chroma-Key Advanced Features
PREMIERE PRO CC: Create a Green-screen Key
PREMIERE PRO CC: Create a Basic Green-Screen Key (video)
PREMIERE PRO CC: Create a 2-color Green-Screen Key (video)