Go to mono price and buy the in wall speaker wire {good prices and good quality}, look up the 5.1 or 5.1 layouts and figure out where you want everything in your room, wire in a tv box even if you are not doing a wall mount {just in case you want it in the future, you can always put a picture over it for the time being}... It is much easier to wire before the plaster is done than after, lol.. You wont regret it...
When I built my house, I wired for 7.2, but I never poked the wires for the rear speakers through, I know about where they are so I can easily pop a hole for the plate in the wall and hook them up, I probably never will, but in case I ever want to they are there. I also did the dual subs, I only had one sub for a few years then upgraded to duals, the wire and plug were there so it was easy, plus it gave me the option of putting a single sub in more places... I also wired a box in the ceiling that is under the plaster for a projector if I ever want to go that way, I have an hdmi cable and 120v cable ran up there just in case, I kept the exact measurements of where the wires are so I dont have to pop a bunch of whole to find them and they arent huritng anything being up there...
