What gets done first on a rehab in from beginning to end

[Raymond Hill]

Hello,

New to investing and reading up on the rehabbing portion. Wanted to know in what order are things done in terms of flipping a property. Is it the roof first and exterior then work on the interior of the property or is it more of whatever is the most important item. 

I am asking because I want to understand the timing of everything snd how long on average does properties take to rehab if you doing a complete rehab from top to bottom in RI or MA or if your just doing a minor situation.