What I am looking to find out is what angels do, what their abilities are, and what their emotions and affections are.
I know they cannot sin.
Please provide some verses.
An angel is just a messenger concerning us and this world. Nothing more and nothing less. We are not told to find out who they are or even concern ourselves with them. God uses them for what ever He chooses and we really shouldn't spend much time on trying to figure out anything more than what the bible says about them.
They were obviously given a choice at one point in time. The ones who chose God instead of satan remained God angels and the ones who chose satan fell from grace and are going to take part in his ever lasting judgement.Are you absolutely sure they can't sin? Lucifer did.