I didn't know how to do any of this stuff when I started out either. I had to learn it as I went along. I could have built everything a lot faster if I actually knew what I was doing lol.
I screwed a strip of wood to the left and right sides of the door opening and attached the hinges and latches to that. I could have attached everything directly to the actual door opening, but there are fewer holes in the real door frame this way. You can see on the left side of this picture that there's the real door frame, then a strip of wood, then a small space and the screen door. You can see a hinge on the right side of the picture - one side of the hinge is attached to the screen door and the other side is attached to the wood strip.
