How to Install a Rope Ladder?

Hi, I have a DIY idea in my head that I need some clarification on. Here is my plan I want to have a rope ladder that I can drop out of my window to get in/out of my second floor bedroom. Here's my problem, how thick/long do the bolts have to be and the tensile strength of the rope to support 200+ pounds? I just need some help on how to do this also would shingles on the roof be affected just by walking on them, in this case should they be secured better on the area that I plan on walking? Any help/advice is much appreciated.