Appreciate a Strategy Critique/advice

Explore Build to about 6000 acres with
250 CS
250 (100% spies)
250 Farms
Remaining Buildings RL

Tech for several days-Sell tech a couple of times a day, use revenue to buy military

Tear down farms and RL and rebuild into 50/50 residents and e-zones.

Switch to Casher-use money to buy food military and oil.

Other Questions

What and how much military to buy during tech phase?