Yeah at 6'8 you will need to get to like 220 just to look like you even lift/not scrawny. So dont fear getting 'too buffed' .
The fastest way to get their will be to hit the weights on a proven template. Start off with one of these for a couple months then move on to 5/3/1 template or THibadeau program....
good tips here also:
For diet pound down lean meat, eggs, green veg and good fats
(if reeealy want to stick to bodyweight only get 'jailhouse strong' by Josh Bryant)