I recently found a website called Focus on Angels. I think it gives good, basic information on Angels and Archangels, spirit guides, elementals and more.

The following is their Introduction to Angels:

It is impossible for many people to believe in something that they can not see, feel or taste, so they close their mind to the idea of a loving entity who is with them always not realizing the little things that happen every day that can be attributed to Angels.
Many of us have images of Angels sitting on clouds, playing harps and smiling down on children, but in fact they have jobs and are working hard on their mission which is to guide us toward the "Light" of which we are all a part . The energy of Angels is all around us, everyday, at all times. They never desert us, in good or bad. They are there for us always. Whether it be in the form of Archangels, Angels, Guardian Angels, Elementals or Spirit Guides. They desire nothing more than to guide us toward what is good and protect us from that which will cause us harm. But because of our right of free will, they are restricted by what they can do, which is nothing if we do not ask them. The only time an Angel may help without being specifically asked is if we’re in danger and it’s not our time to go. It is not wrong or selfish to ask for your Angel's help, as the Bible verse (Psalms 91: 11-12) states, "For he shall give his Angels charge over thee, to keep thee in all they ways..." We were given the gift of Angels, it is expected that they be called upon when needed.

They also provide information on specific Archangels including Michael, Raphael and Gabriel.