I have 30 parcels of vacant land, can I build cheaply?

[Kevin Parekh]

This may be the dumbest post on Bigger Pockets, but I have to start somewhere.

I have been investing in vacant land for many years. I buy parcels in North Florida cheaply through my fathers connections. Most are in low-medium income neighborhoods. Some I have owned for 10 plus years. I havent touched this stuff bc I was in college or away with the USN. Finally, I am poised to make a move forward:) This leads me to my question:

Has anyone gone through the process of building a RE/ cash flowing "Empire" by building on vacant residential land? Can I build cheaply? How did you do it? Should I run for the hills and contiunue to flip land? What resources did you use? Is there a youtube channel I shoudl watch? 

I talked to about five builders in my area and they all mentioned about $100 sqf/foot. 

I recently listed some parcels with a REA, but I started to think about building vs multiple streams of income. Right now I only make money from my 1099 job, capital gains on the parcels I sell, and rental income from (4) pre-existing mobile homes.

Thank you in advance!