Tips for pre-wiring home theater?

I just finished framing my theater and we're about to start wiring in the next month. My end goal is a 5.1.2 system for the 300 square foot space. The length from the receiver to the farthest speaker will only be 15'-20' max.

We'll have 2 recessed lights in the front center and 2 recesssed in the back. 2 sconces on the left and right walls beside the seats.

Is there anything I should consider as far as HDMI cable, Ethernet, wire gauge, length of wires, height of speakers, wall plates, projector mounts, etc. I'll take any recommendations.

Thanks!