The home is in a tract neighborhood where it's not a mailbox directly in front of the home, but many mailboxes for the neighborhood grouped together.

I have a large tract of land that will likely be developed for mixed use.

Duplexes fall under single family code, so you can build up to two units on a single tract unless prohibited by deed.

I plan to start buying large tracts of land to develop into a subdivision.

This is a new feature we offer that provides data and easy-to-digest data analysis and rental comps for every city in the country. 

TX is very strong as @Joe Gore indicated &  @Hattie Dizmond suggested pick a market.Spend some time digest the old forums on different city, county & state, you will be surprised  how fast you can learn on yourself, Be patient, RE knowledge take time . 

When I started to digest some of the advice in the guide, I began to really concentrate on what I and the investor were focused on, which was to find and make deals happen.

Let's say that there is a tract of land you would like to own, but it has far more acreage than you need. 

You will know what you want to concentrate on after you digest enough educational material to make an informed decision. 

I use Excel to organize the data and a software called Tableau to put the data on a map.Each region is a census tract, which is the smallest geographical unit that the Census keeps track off.