Yes, there are too many marketplaces nowadays that are focusing in employers that want to pay their workers in bitcoin and as well as workers that would like to get paid with the same. Like what we have in the Services from the forum and also in reddit subforums.

Those are just the few that you can search out.

Yes, as long as you have internet connection and a wallet. You can receive and send it to anyone wherever you are.

Start with the basics about like understanding the concept of wallets through this thread: [General] Bitcoin Wallets - Which, what, why?