I would suggest that you read a lot about the subject.. And I do mean a lot.
Summoning is not easy. Although it is not so much my thing, I have a book called Summoning Spirits: The Art of Magickal Evocation.
The author states that, while it is possible, success in summoning is not to be expected for at least a few months after starting with the training, suggested in the book.
I have never tried any of the rituals in the book, mainly because it didn't really appeal to me, but also because they are very, very complicated. It involves creation and charging of complex sigils, chanting in Hebrew, and remembering many techniques during the ritual.