If you put your back to the frame on the hinge side, if it swings left, it's a left hand, right, it's a right hand. Your door should be beveled to the inside. You'll want a 1/8in gap max, all around, with the door closed, when you're done. The top header should be flush with your framing, to accommodate the outer siding. Above that you can fashion a drip edge, or use a factory made(they're Al, about 36", stick out about 3", with a small upturn at the back for attaching to your wall.
Frame in your door opening to accommodate a 1x(actual measurement generally=3/4) casing, and secure the door to that (with screws that will reach into the framing). It isn't easy to hang a solid core door by yourself, but it can be done using shim blocks to hold the door while you sink the screws
Here's a link to some info, I didn't study it in depth, but it looks informative Doors - Chapter 8: Doors and Windows - Woodworking & Carpentry Online
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