The first being to help a family in need and the second being that I can learn how to paint, install flooring, etc. at no cost.

Painted or stained tongue and groove?

For some trades like general labor or painting it is considerably less.The $250. for the exterior door installation is a lot less than we quote.

If the wood had previously been painted the existing paint will keep the new stain from sinking into the pores. 

However, since I am saving the historic doors and overall trying to maintain the original "charm", I am playing with the idea of restoring the windows.The glass is in good condition, however in two rooms they have painted over the glass with paint (why?!

The one variable I'm not certain of is the comps I have run, which I need to trust but verify.Pictures from home appear in good condition with possibly just paint & carpet, estimating 15kStarting with the end in mind, I would have a couple strategies, or exit strategies if I were to target rehab buyers, and/or buy & hold at the same time. 

Do you just figure a flat figure that covers a traditional renovation (i.e. new floors, paint, appliances, cabinets, counters, baths etc.)? 

Its a special paint specifically for roof painting. 

I've had offers show up and need decisions within a day.I hope my banter isn't coming off as arguing, simply trying to paint what potential clients of yours might see as hurdles.

Patching holes from supply's and returns and paint.