There are none that will work for sure. Before casting your first spell, there are a lot of things you can do to help insure that it will work.
Firstly, are you good at meditating? Meditation is key to understanding the way energy flows within your own body, and can help to release energy to cast a spell.
Secondly, are your Chakra open? This is a very important question.
Read up on Meditation, techniques for opening and aligning your Chakra, and various types of Magick.