I come to america 4 days ago and I want to play on a basketball team but I do not go to school. help me please?

I come from ghana 4 days ago and I want to play basket ball on a school team. Am not that good but I can play good and want to play and get better. my mother do not let me go to school because I have not been to school in long time and my father do not go with us to america. my sister and brother back in ghana. I am 16 and 7'3 and a half. how can I play on basketball team in america? i like it here a lot.