I'm new to GI and as suggested by many, I upgraded my coaches a little, but spent most of my money on building some excutive seats to get more money flow. The new seats are now built. What should I be saving my money for now as my next major investment?

-ugrading the stadium again? If so, to what?
-buying good players?
-upgrading coaches again?
-building a facility? If so, which one?

Here's what I've done. Hopefully, you can find something useful in this.

I've been working mainly on my stadium. VIP seats will be full next week and some exec seats will be ready then as well. I've bought a few players off the transfer list, but no big stars. Just players I could get cheaply that were better than what I already had. I will finally be upgrading my coaches tomorrow (fitness only at this time). I will continue to expand my exec seats and should have them finished by the end of this season.
It doesn't look like I'll promote this season since there was already 1 other human owner in my league when I joined and he has the upper hand on that promotion spot right now. So I'm gearing up to promote in season 4 and hopefully, be able to shoot up the divisions after that. With my current budget, I should have all my VIP and Exec seats built, full coaches and lvl 1 training hall (and maybe fitness center too) before season 4 starts.
While I could have improved coaches and bought stars early to improve my chances to promote this season, I preferred looking long term.

When you do decide to buy facilities, the recommended order I feel is

1a. Training Hall
1b. Fitness Center
I can see arguments for both options and I don't think you'd make a mistake choosing either over the other. But one of these should be first, the other 2nd.

3. Club Shop
From what I understand of the club shop, it brings in good money, but is really worthwhile when you get to higher divisions. So I plan to wait until I'm in a higher division before I buy.

4. Youth Academy
Not worth buying in my opinion. Others may disagree. You still only get to choose 1 player. Instead of 2 players to choose from you'll have 4 (or 5 w/ upgrades). The stats could be slightly better, but not definite and the possible improvement is minimal (range of 4-6 vs. 3-5). It's still a guessing game on which player to choose.