Now I'm currently ranked 2nd right now, on my first round playing this!! I got it set at

5% Spies
65% Troops
30% Turrets

and I'm selling my Turrets, and buying Food when it get's low, which has been just one time so far.

About producing troops, I've had too little money to get them from the market. All the money from selling Turrets has been going to building zones.