I have and older 1950's house that has had little done to it. I want to replace the windows, siding and add insulation to the outer walls. I am hoping someone can tell me the right order to do this in so I dont wind up redoing or messing up one thing to do another. any advice or input is welcome. The house is about 900 sq feet, there are 13 windows- its a flat roof; there's a crawlspace underneath that has a the black plastic on the ground... thats about all I know. thanks in advance for help.