Your ideas about reading are the right first step. There should be some good books at home store libraries.
Unless the roof has fallen in, which I don't see, the damage may just be to trim, and plywood, easy to replace. The only hard part of that roof is the chimney flashing..
Vinyl windows are inexpensive, can be ordered to fit the opening, and won't rot. Inexpensive steel door, directions are usually clear enough for a DIY to follow. But they come is basic standard sizes. You may need to modify the opening if not standard. Opening is usually 2" larger than the door slab, 36x80 door needs 38x82 openig.
Unless the roof has fallen in, which I don't see, the damage may just be to trim, and plywood, easy to replace. The only hard part of that roof is the chimney flashing..
Vinyl windows are inexpensive, can be ordered to fit the opening, and won't rot. Inexpensive steel door, directions are usually clear enough for a DIY to follow. But they come is basic standard sizes. You may need to modify the opening if not standard. Opening is usually 2" larger than the door slab, 36x80 door needs 38x82 openig.