I know guys
aren't supposed to read. Oh... ummm... manuals.
This is the one time that "wisdom" gets thrown out the door. I've
encouraged you to learn about the gear, not just so you can make informed decisions as you shop, but so you don't have to shop again when you blow a driver or an amp, etc.
All my stuff had great welcome and set up guides. Your AVR will do the same I think when its connected to you TV, but ideally, you still get everything connected first.
If you're rearranging the room... this might be the time to do that. If not, cut enough speaker wire to go from each speaker to the AVR +3' so you can move things if needed. I would measure, AVR to Floor to Speaker to Binding Post +3'.
I don't like your TV stand as a home for the AVR... not enough room to breathe. Do you have anything that you can use short term so the machine can get proper air circulation and avoid potential overheating? Its ok to set up the AVR to the side of your TV stand... just put it on something, even a 2'x2' plywood square would be good for the short term.
BTW... speaker wires DO NOT have to be the same length. (I still struggle with this, but when you have 7-13 different wires running around, just giving yourself enough slack to move your AVR is best... Coiling tons of cable behind your AVR is
never a good solution.
Hope this helps get you going, Amigo!
Cheers