I will agree, with feragnosis.
I spent a good few years learning before I even attempted to cast a spell, let alone summon a demon. The craft is not all fun and games, things we do have concequences, especially if you are unprepared and do not know what you are getting into.
Start with the basics, of meditation, centering, grounding, visualization. Read a lot of books and information on topics you are interested in before you jump in, it will be easiler for you in the long run if you put down good foundations.
A lot of your first tries will come to nothing, you need to knowledge first before you can get the results.
I wish you the best of luck.