Answer:
I am the first you ever saw, what greets you every morning and what goes out in the end.
One am I, among six others: Largest, smallest, cold, dark and two brothers
Usually green but can be brown. It's a great place to play or lie down. What is it?
What must you give before you can keep it?
What can you never get rid of when you lose it?
Though not a plant, has leaves. Though not a beast, has spine. Though many wouldn't need this thing, It's more valuable than wine.