I think Hollywood is responsible for a lot of people's views on angels.
The bible states angels are messengers of God. They are heavenly spirits. Satan is an angel as well, and many others fell from Heaven with him.
We do need to keep in mind that Satan can disguise himself as an angel of light as well.
Angels were not created to work for us. They are above humans. They work for God. They do not interract with Humans unless God says., and contrary to what many people believe the bible is not very clear on the concept of guardian angels either.
Will God use people to help others? I believe he does? Will he use an angel to assist is in time of need? Well, if he wants to do that then he will, but keep in mind that God does not need an angel to guide us. Our faith is our guide.
One more important thing to consider about angels is it is extremely forbidden to praise an angel as you would the Lord. In Revelation John bowed to an angel, and the angel told him not to. He is to bow before the Lord.
One more think to consider about Satan. Not only is he an angel, but the bible describes him as the most beautiful one before he fell from Heaven.