I did a lot of study including reading Mike Butler's Book - Landlording on Autopilot (highly recommend it).

From studying your listing photos, it may be a similar situation. 

Then you're basically studying the comps in the area to see what your property once fixed up could likely sell for.

I would study the MLS if you have access to that, play around with that to see what houses are selling for in different neighborhoods.

When studying long term trends of an area, what metrics should I use to determine if an area is being over or under built and where can I find these metrics?

I like to study my local zipcodes of the income reports.

I’m aspiring to be a developer, looking to study each line and run numbers.

So a little about me, Ive been studying, listing and reading all I can about real estate investing I've been walking and spending time in the neighborhoods I'm targetting which are B class neighborhoods and gentrified areas, neighborhoods where the price will vary from millions to 500K  depending on what street you are on and how extensive the rehabs were. 

Study on youtube, read creative financing books.   

I have been studying Jacksonville/St John's County (SJC #1 School District in the state) for about a month now.