Run the wires and you can swap out components later if you want. You can go wireless, but sound quality can suffer a bit if you are REALLY sensitive. Other than the center, maybe the fronts (maybe) and the receiver, rest don't do much. The people who had our house before us installed like 15k in DynAudio speakers which is a joke since while the quality is great, it is unnecessary for a home theatre system - 3k for a 3-way rear speaker pair that does almost nothing? I installed a 18" FI Infinite Baffle Sub (worth considering since they don't need a box and you can hide them in the wall, but they need supported and this one can shake my house). That sub and the amp that it has will hit like sub 20hz and really shake things up for ultimate effect. The receiver will likely matter more than the speakers, other than the center, so don't go too crazy or worry about this too much.
For example, the AFC Championship was on 7.1 and the side and rear speakers just played crowd noise (annoying) and the center had Jim and Tony and I did not hear anything from the R and L front. The sub would shake the room when a flag was thrown or in a commercial. You can literally find an infinite number of speakers and receivers to do this... so just pick a budget and don't worry about it too much. A fun use of the thing is watching golf of the masters where you can hear birds chirping or water running on the rears and sides. Movies sound great, but the kids can wear themselves out by turning it up too high... literally.
All of this is from a real Audio dork/aficionado who has Focal Utopias, McIntosh tube gear and plays vinyl records on a system where you can tell a difference in lossless digital vs. vinyl that makes Bose or Sonos cry for being bad quality. Where quality matters in the audio arena and you can tell a difference with higher priced stuff, it just does not much for a theatre room outside of the center, some ambient noices from the sides or rear every once in a while and having some bass when stuff blows up.
Don't sleep on the video part of your receiver... some can really mess up a 4k signal (or even 8k) and some are better than others. Do your homework.
I also agree with conduit, especially for the video cables - one day coax is fine, next day HDMI and who knows what is coming later... probably fiber for everybody.