Yellow Flag Directions: Buy the second farm from the left to start, 
building a mine near the treasury and a mill near the tower. Upgrade
the farm and the mine, staffing the mine quite a bit, filling in 
around the lumber mill with merchants to get cash. 

Build the first market near the treasury and focus on upgrading it. 
Buy the rest of the farms as you can, building markets and upgrading
them after the one near the treasury reaches a 3 star. Move merchants
from lumber mill to markets as they're built. 
You can eventually buy the treasury, then destroy the mine, replacing 
it with a market. You'll be able to staff it with merchants to hit the
money goal with a bit of time to spare.