Farming Neighborhoods: Basic Questions

[Carl Ohai]

I am learning about neighborhood farming, but I am a bit confused about how it generally works. 

1. How big of a farm do agents usually start out with? 100 houses? 500? 1000?

2. What forms of contact do they make? Mailers? Door Knocking?

3. What kind of stuff do they send? Housing market updates? A bunch of "Contact me for free housing quotes?"