Attach the wire or cable to a fish tape or coat hanger using electrical tape and feed it into the hole until it reaches the opening at the other end.
How to run wire down wall from attic.
When working from an attic space it will be significantly easier to access a wall space on the floor below by working either an interior wall or the exterior wall that is on the gable end of the structure.
Return to the attic or basement and drill through the wall plate where you want to guide the wire through.
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How to snake wires through insulation.
It will be next to impossible to drill downward under the portion of the roof that slopes to the attic floor without a right angle drill.
If you re working in a crawlspace you can use a flex bit drill to drill this hole from several feet away.
Depending on what the wiring is for this may be go through the drywall to the ceiling for instance for new lighting or be farther down on a wall.
And use semi rigid wiring fish tape to pull your wiring down to your outlet location.
To run cables vertically go into the attic or basement and drill holes in the wall plates above or below the locations of connection boxes.
When adding or replacing wiring in finished walls most electricians will attempt to make the horizontal portion of the cable run in the unfinished attic or basement crawlspace areas looping the cable down or up through the wall cavity across the floor or ceiling joists then vertically through another stud cavity to the next wall box opening.
Run the wire or cable to its destination.
If you will need to fish wiring through a wall drill a hole through the wood plate in the attic only.
Cut a hole for each box with a drywall saw or a saw appropriate for the wall material then feed the wires down from the attic or up from the basement toward each hole using a fish tape or a fish stick.