Once the hole is cut in the wall insert a drill bit to drill a hole so that you can run wires through it.
Running wire in attic.
For the horizontal portion of the cable run this can involve drilling holes in the joists where the cable will pass.
You simply mount a small plastic clip to every other joist.
The clips allow easy access if you need to run.
While one person holds the flashlight the other person should use a staple gun to run the wire along the rafters from one entry hole to the other.
Keep the holes centered on the studs.
If you can run it across by stapling it to the rafters you can avoid the insulation thing.
After you ve run the wires through the clips you snap a plastic cover over the entire assembly.
Remember to use a right angle drill with a hole saw bits for boring large holes.
The staple gun should be loaded with wire staples designed for holding the size and type of wire you are running.
The bottom of the floor joists you can run the wires through raceways that fasten to the bottom of the joists.
If the attic is inaccessible you have less a worry about protecting the wires than you would if it were a storage area.
Do not drill them through the joists or rafters.
The following links will assist you with your electrical question.
Bring all of the wire up into the attic.
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.
Drill a hole to run security camera wires from your house.
Yes this should be corrected and it would be good to have the wiring and all the circuit connections inspected as well.