I completely agree with the people above. Before you even think about getting into the more physical aspects of magic. Do a lot of mental studying. You really don't need a teacher, all you need to do is some research. This may take months even years but gain as much knowledge as you can. You will then know when you are ready to do a spell, cast a circle, do rituals, etc... Trust me, the wait will be worth it. Also, the years of studying actually goes by really fast, because it is fun (well at least to me it is :P). Me personally, I really do love the idea of you being your own teacher, because you won't have to be taught a traditional way of magic, or you won't feel restricted, you make your own rules... but at the same time you are responsible for you and you only... so don't do anything you might regret.. But, yes research is the key to do successful spell casting!!
Blessed Be & Much Luv