Then they sell as many as they can at top dollar until something changes, then they start discounting and starting 'Fire sales" which hurts the previously purchased homes since the last few get sold for less.

I would find out their DSCR ratio and make sure you can hit their minimums either upon purchase or when they desire those ratios (maybe after stabilization in a year or so).5) Unit Turns/ Re-Leasing.

My mother is in the beginning process of purchasing a home in the Bronx, NY as an investment property.

Hi, My name is Haiden, and I'm looking to purchase my first residential investment property within the year.

Marty,Avoid templates because they are specific to certain factors and by following someones BRRRR you open yourself up to mistakes. 

Cap Rate = NOI / Purchase Price (or Market Value). 2.

I don't know too much about North Charleston and Summerville specifically but investing in real estate has been challenging country-wide since rates went up. 

Purchase price: $200,000 Cash invested: $75,000 Sale price: $430,000 Pocket listing.

If you purchase more than you sell then you are adding additional depreciable basis. 

If you want to network or ask specific questions about your local market, go to your local real estate forum and connect with investors from your area: https://www.biggerpockets.com/forums/86-local-real-estate-networking5.