A little late on this one but WOW!!!
I have shot professionally for many years. Hear is my opinion.
Measure wing span divide by 2.5 as others have said.
I rep carter releases and can definately say all of the T handle and wrist strap releases will and do shoot the exact same draw length.
The end of the head of the release should be at the very end of your palm right where your middle finger starts.
D loop should be about 3/8+or-
You are better off shooting an inch too short than you are shooting 1/4" too long.
You should end up with a slight bend in your bow arm and have a positive anchor with as many contact points as possible[ corner of mouth, tip of nose] these are contact points for the string.
You hand can have 2 or more points as well.
Contact jaw and high elbow with contact with your ear as an example.
Deep breath and slow exhale, high elbow will drop slightly, have your release preloaded and the drop of the elbow will execute the shot. It will and should be a surprise.
If you have any questions feel free to call. I will even offer to set you up at my shop if you wish.
I wont leave my number here but feel free to pm me