I'm 17, 6 foot 8-9 and 250 pounds...I have some sort of abs but not that good V thing......

What should be my body fat percentage? BMI?
Exercise?



the v shape is
something like this

http://upload.wikimedia.org/wikipedia/commons/b/b7/Carlsons.jpg
Here is my body now...
(I'm the only one standing up..no better pictures..lol)
http://photos-e.ak.fbcdn.net/photos-ak-sf2p/v248/73/1/515320982/n515320982_917220_6793.jpg