What is the best colour Tenth Edition Theme Deck to begin playing Magic: The Gathering with?

The way you describe yourself you would want to use either green or white. Green is known for its mive creatures and ways to get them out quick. White is best know for life gain and protection. Also the creatures it uses are small and quick. Me personally i like to combine red and green but since you want a mono-colored deck go with either green or white and work your way up. Good luck.