The staple gun should be loaded with wire staples designed for holding the size and type of wire you are running.
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.
After you ve run the wires through the clips you snap a plastic cover over the entire assembly.
This is because the top edge of rmc has to be only six inches below the surface of the ground while uf must be buried 12 inches deep deeper in some situations.
Yes this should be corrected and it would be good to have the wiring and all the circuit connections inspected as well.
Drill a hole to run security camera wires from your house.
The clips allow easy access if you need to run.
The attic wiring should be protected and secured to ceiling joists or other wood structural supports.
If the attic is inaccessible you have less a worry about protecting the wires than you would if it were a storage area.
You simply mount a small plastic clip to every other joist.
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.
Bring all of the wire up into the attic.
Running wires inside rigid metal conduit rmc is a little more expensive than burying underground feeder cable uf but it saves labor.
Keep the holes centered on the studs.
The bottom of the floor joists you can run the wires through raceways that fasten to the bottom of the joists.
If you can run it across by stapling it to the rafters you can avoid the insulation thing.
Remember to use a right angle drill with a hole saw bits for boring large holes.
The following links will assist you with your electrical question.