Reddit mentions of Pull Line for Light Duty Cable or Rope Pulling, 210 lb Average Breaking Strength 500-Foot Klein Tools 56108

First, do it now, while its not to hot/cold. running cable in the attic in the summer sucks. you kinda need 2+ people to run cable. it can be done solo, but that brings in so many more complications, beer for buddy. so yeah, like /u/xmangusx said, you don't want electronics up in the attic, top of a closet should be ok, somewhere a little more climate controlled. i haven't run cable in residential in a long time, but did do up a new floor of a building, and work at a datacenter, so take the numbers as a rough guide.
even if you think you want just 1 jack in each spot, run 4 cables to each room. alot easier to run a bundle of four now, then to go back and add in cabling later, even if you just let the bare end dangle behind the drywall. below is some suggested parts:
1000FT Cat 6 Bulk Bare Copper ethernet cable

4 hole keystone wall plate

cat6 punchdowns

keystone blank plates

electrical box

punchdown tool

network cable tester

24port patch panel will work in 19inch rack

wire line puller

pull string

so 1 blue box, 1 wall plate, a few blanks ( as desired # of ports) per room. start in somewhere a little less important like say the laundry room, or a closet, so you can get a hang of using the drywall knife to cut the hole, how big it needs to be etc. you will want to be near ( but not to close give liek 6 inches) to an electrical outlet if you can. use a studfinder, it should be where the electrical outlet is ( which side is the box on). find where the electrical cable comes through the 2x4, move over enough to account for stud width plus a little fudge factor, and drill a small hole, maybe 1/4 inch, just big enough to get the end of the fish line through. cut small hole in drywall near the electrical outlet ( opposite the stud) start with maybe 2 inch by 2 inch, will need to be bigger later for the box. run the fish down from attic through the stud hole you drilled, behind the drywall, and find it in the small hole cut. attach pull string to it, and pull it back, and keep pulling the pull string all the way back to central location. repeat till have all holes cut, lines run. now you will have a pretty good idea if you will need 1 or more cat6 1000ft spindles.

the hard part is going to be getting around in the attic, and simply finding a way to get from point a to be with the cable, creative use of a drill bit will be necessary. the punchdown blocks that go into the plates are color codes, do all A or B throughout the house, don't mix-n-match ( B is more common ), and is color coded. only will need a crimper, ends, is if you want to custom make the cables going from patch panel to switch, hint just buy 20 or whatever of appropriate length cables premade from monoprice, like $1 each.
expect 2 people who have never done this before, this to take more than 1 weekend.

This is the line pull I used: https://www.amazon.com/gp/product/B0026TA6WK

along with this cable lubricant: https://www.amazon.com/gp/product/B000WTN3I0

Absolutely run the cables before committing the concrete. Also seal the PVC conduit joins with PVC cement, otherwise they will eventually become waterlogged. If you haven't already purchased the Cat6, I recommend shielded outdoor-rated direct-burial cable, like this.

I also suggest running some low-voltage cables along with the Cat6, so you can power external IR illuminators like these, which are way better than the IR LEDs in the cameras, and also avoid insects, fog, and dust from triggering motion alerts at night.

Good luck!

They ran out of zip ties and started using twist ties for cable management. When they ran out of those too, it looks like they used pull line left over from pulling network wires through conduit.

It looks bad, but it works.

This guy has the right reply. The conduit to use.
https://www.google.com/search?q=flexible.ent.cable&ie=UTF-8&oe=UTF-8&hl=en-us&client=safari
The cut in low voltage “ box “ to use.
https://www.monoprice.com/product?p_id=7013&gclid=Cj0KCQiAi7XQBRDnARIsANeLIev8bAAphQ1eitYojMoMLgOPzyIFmvSKZ71KXdPwHA0EP4FeMiQtH8IaAjR0EALw_wcB
Put this in the conduit to pull up cable leave a spare for future.
https://www.amazon.com/Klein-Tools-56108-Poly-500-Foot/dp/B0026TA6WK
Leave 6” to 12” of conduit above the top plate and use a conduit clamp to secure it to the top plate. Have the conduit stop just at the top of the conduit “box”. Tie it to the cut in box with some wire so it stays in place. The cut in box has two screw holes so you can attach any type of plate you want. Drill in the center of the top plate. If you have insulation you will need a fish tape. If you have a fire block you will need a an extra long auger but they make them three foot long and the are designed for pulling wire. Klein and Greenlee make the industry specific tools. Good Luck !

you should be able to do this pretty easily. just make sure you attach it really well in case you pull through a tight spot. nothing worse that a line coming free in the middle of a conduit somewhere. (former network installation tech) if you wanted to future proof it in case you need to add more lines later, get a roll of [fish line] (https://www.amazon.com/dp/B0026TA6WK/ref=cm_sw_r_cp_apa_OW8GAbE743V36and) and pull that with the new cable.

EDIT: fixed link