I am a newb as well, but everything I have heard and read on this site says it's decently difficult to bottle from the keg. The beer tends to be flat unless you use a specific tool that infuses co2 a certain way. Do a general search on the forum and you will see some great posts on this subject. I would think it would be easier to bottle what you need and keg the rest. Obviously you would need to measure your priming sugar accordingly. No priming sugar necessary if you plan to force carb in a keg. Good luck.
“Alcohol may be man's worst enemy, but the bible says love your enemy.”- Frank Sinatra
“I feel sorry for people who don't drink. When they wake up in the morning, that's as good as they're going to feel all day.”- Frank Sinatra