@Doug McVinua yeah I agree with the pattern of development in Phoenix.

Becoming a developer take years of in-the-trenches learning. 

If you could possibly share any spreadsheets or templates you use to help me develop my Excel spreadsheet, I would greatly appreciate it!

We just completed are first flip in Bow and just bought a 5 lot single family association in Hampton; We are excited and nervous at the same time, we weren't really looking for developments, but numbers worked out so we will see! 

I already have an existing business and units ready to be placed so if I could get 40-50 units rented it would be nice to have that income as I prepare for the larger development costs to come down the road.I hope to build a much larger pad where I will need additional permits and then eventually actual self storage buildings.

You want to get in at a good price and develop a great product through your rehab.

I left the field of architecture to pursue a career in RE Development.

To simplify my post I'm asking how to develop my buyers list? 

I was approached by a realtor/broker/developer to do a larger storage project. 

It seems like you really have developed a good understanding of real estate in a relatively short time from all while maintaining a full time job as an engineer.