It's all about your mind. Just think about calling out for a spirit and if it wants to come it will. You can call a specific spirit (with or without the name, you just need the thought of them) or...
That depends on the context. "Genki", "iji", or "chikara" are the terms generally used to describe figurative spirit, or zeal. "Chikara" actually translates more accurately to "strength". In terms of...