Angels are just as much myth as reality. They exist on the astral level. We, in my experience, are not assigned these beings therefore you cannot summon "your" angel. Many of the famous angels throughout history such as Michael, Samiel(sp), Gabriel, Azazel, ect.. can be summoned but i do not recommend it. The astral versions of these myths believe in what they are and will promote what they think to be fact, such as belief in the judeo-christian god.
I also recommend not doing the spells on here. Not because they are fake, although i do believe some were made by roleplayers, but because designing your own ritual tends to have better results than one made up by another. Read books and study. Then when you think your ready come up with your own habbits and practices.
When you make a psi ball you are using natural energy found in your body. I consider the ability to control this energy magick however the energy itself is just that...energy. And no...it is not similar to taking care of a kid, it simply dissipates unless you give it a task. Once you do that you need to program it to dissipate once the task has been completed. Never under any cercumstance should you ever create anything to think for itself.