* Do I need to let the subfloor acclimate to the house before install?

A good idea to do so

* I'll be gluing and then screwing the subfloor into the plank board. I've been told NOT to screw into the joists. Is this right? Do I actually need to glue the subfloor to the plank board?

First make sure your plank boards do not squeak, now is the time to screw them down to the joists to get rid of floor noises. Then you secure the subfloor to the planks, does not matter if you secure to the joists here and there. You just want the subfloor to be down and not move.

* What do I do for spacing around the outside edges of the new 3/4" subfloor? Do I need to space at all?

Not just the outside edges, but all panel edges should have a 1/8" space for expansion and contraction. This helps stop buckling and squeaking. You do need the space on the wall edges also. The finished flooring needs that space as well. The space is to be covered with baseboard.

http://www.woodbywy.com/2015/02/17/9-common-subfloor-mistakes-avoid/

Also use correct fasteners, either threaded nails or screws. Standard nails will result in nail pops over time.

Thank you. Great info. Do you still recommend to use glue between the subfloor and the planks?

It looks like most of the tongue and grove has space between the subfloor sheets and I'll just have to worry about the edges on the wall.

I plan on using 2 1/2" construction screws for my fasteners. Hopefully will be nice and quiet!

Thank you!

One way to almost guarantee no squeaks is to add a layer of rosin paper or even 15# roofing paper between the planks and the new subflooring. Staples are the best fasteners---as long as you get them all the way in, not proud of the paper.