Default [Q] $$ Android 2.2 Based Product Development license Required or Not ???'‏

Hi
I am Developing Android 2.2 Based Product; I have some Questions Please reply

1. Since Android Open source how can I Get the OS 2.2
2. Legally can I use for my Product
3. Can Sell the Android Based Product all over the world?

Waiting for Your valuable reply?

Regards
Venkat