Summoning is a very serious ritual act not a spell. Perhaps you should learn that before trying to summon something. Also it is wise to know what your summoning and how to deal with it should something go wrong before you call it up. Just some thoughts, go learn
I'd recommend practicing with smaller stuff before you try tackling a summoning - those are tricky, and regardless of your intent to summon something not bad, you could end up with something wicked. Had that happen to a friend of mine when she started dabbling with black magic for the sake of looking "cool"; ended up letting loose a poltergeist in our house, and it followed us to our new apartment until we had a shaman come in and handle things properly.