Why do you need to summon an angel? Is the Holy Spirit not within you already? What more could you need but The Lord Himself, unless you simply enjoy defying Him?
I don't know. Cornelius Agrippa, read him. He is good source on this information. Try magic squares as well, I once used one to move someone's furniture around without their consent
So how do you active the telekinetic magic of a magic square? You just look at it and relax or do you draw it on a floor with blood or something like that?
You have to fill it out yourself. It is kind of hard but it's like Sudoku, you get better with practice. There's only one 3x3 magic square unless you count rotations of it. But there are more 4x4 magic squares