Buy a bow from a shop, they can fit it to you properly, teach you how to use it. Quit buying shit online from China for a $15 discount from a local bowsmith. You will be happy you did buy it from a person in a shop, you can get it tuned from them, they will add accessories for you, let you try it out in an indoor range.

If you don't know what you are doing, how will you know your draw length?