Since you just ordered some new equipment, once you get it set up & run in, start doing some listening & see if you like what you hear.
The key here is when you discover something you want to change to only make one change at a time, otherwise you'll never know where the change is coming from. Before you start changing things, I would suggest you work with your room as much as possible. Speaker placement is the easiest thing to do that affects the overall quality & don't be surprised if it takes several months to achieve the best spot.
By working with the room, you can also work w/placement (if possible) of the system itself, the furniture & room treatments. This is where you need to do some homework & search the archives, here & on AA.
Then there's the AC issue. Again, you need to do some homework plus find out what condition yours is in before you start working in that area.
This is just a rough sketch and you can start today by getting a notebook & start taking notes. Draw diagrams, put down your thoughts, what you like & don't like & how it changes, etc.
Have fun!