According to your profile, which is blank, I am going to assume you are new to magic.
If that is the case, you should not even be thinking of summoning. It is very dangerous. Summoning is not for fun and games. It is a serious ritual and can be very dangerous if tempered with the wrong way or do it without knowing the correct way.
I suggest you learn the basics of magic first. These are located in the forums. Just search for meditation, centering, grounding, energy manipulation, and visualization.
Even those who have practiced for many years still do not summon spirits. You really need to know what you are doing.