I plan on contacting FSBOs and FRBOs listed online and would like to scrap phone numbers from the listings and contact them via VM using Slydial.

As Account Closed pointed out, you should have had an actual Approval Letter first, which details the price, costs to be paid by both parties and a Net to the bank.  

Until that purchase part of our holding costs was rent paid.

I got home and every property in the auction had been taken off/ cancelled and paid... ha it was a learning experience to say the least but very discouraging.

I had a duplex at one time with a fuse box and to be honest, that was not something the tenant ever paid attention to nor did it really reduce expenses.

As it stands my knowledge is pretty basic, just what I've learned browsing the forums and gleaming through materials online, but I'm a quick study and want to really make an effort My specific areas of interest are wholesaling, buy and hold for rent purposes, and flipping once I become knowledgeable enough about the Philadelphia market. 

He paid $300,000 and was able to make about $100 per month renting it out.

You can also look for the Landlord Tenant Handbook on-line published by the HCIDLA. 

I have been browsing duplexes and triplexes online, to see what the market looks like now.

HI I purchased a home in a multi unit (R4), high density zone.I am currently renting the house cash flow is just $50 after mortgage payment.This house has a big workshop in the back with a high rise ceiling, brand new roof, electricity and water.It sets in a half an acre lot so I am able to rent the workshop and land for $700 a month Total cash flow on this property is $750 a monthI'd like to enclosed this workshop (it has 3 brick walls already built) and make it into a livable place.I can still rent the land and keep the cash flow at about the same amount ($700).However there's no sewer  at this house just 2 septic tanks attached to the main house.Workshop will need:windowsanother walldoorscooling and heating systemBathroom etc...I can build build more units attached to the current workshop since there's so much land to play with but i have no idea of the cost.I purchased this home for $150k in 2016I owe 143Klast month I paid for an appraisal and the current value is at $185(flooring was the only improvement at the house).Question is should I refinance and bring in sewer line, build more units or live it the way it is?