As others have mentioned, learn the fundamentals and analyze each property individually.

Keep in mind that each individual property has different utility bills (due to energy efficiency, possible water leaks, square footage, number of tenants, etc)  Calling the utility company will at least give you a starting point. 

I have called several individuals in San Antonio from homes I have found in Craigslist but so far I have not been able to pin a house down. 

I'd like to connect with anybody on here, and especially the individuals from San Antonio and nearby areas.

I would love to network with other individuals around the area that understand creative real estate investing & other wholesalers as well.

Is it recommended to wholesale individual apartment units?

It is awesome to connect with other like minded individuals.

In short, if you want a seller-carryback note created on or after January 1, 2014, if it is a private individual, trust, or estate, then ask them to sign an affidavit saying that they have not done more than three in a 12-month period and how many of them had balloons.

Being ok with walking away from groups & individuals or just tolerating them is also something to expect/experience.I suggest REI groups.  

To determine the exact standards that you need to conform with, you will need to fully investigate your individual state statutes and regulations and or hire the appropriate licensed contractors and licensed property managers.