So I disputed the additional charge. 

Similar to the comments above on using FurnishedFinder, also check Airbnb and sort for 30+ day rental options. in addition, I'd recommend talking to the local university and hospitals nearby by calling to their various departments.

Not a book, but Bill Faeth has a lot of free, good content on his site and YouTube videos.

In addition, all Rent payments hereunder not made within five (5) days of the due date shall bear interest at the rate of one and one-half percent (1-1/2%) per month"The monthly rent is $1550 so the late fee is easy - I've set the account to charge 5% if the rent isn't received within the 10 days stated ($77.50).

You could say it took a long time to get an additional 11 units given I closed 20 units in just 10 months of getting started with my investing.

But I noted that places like North Tonawanda as @Pravit Jarriyapurttipong mentioned are actually outside of Erie County, it's in Niagara County, which follows the stricter landlord laws as New York State... https://ag.ny.gov/sites/default/files/changes-in-nys-rent-la...Would you recommend sticking to Erie County boundaries for this purpose?

To help support that avatar, try and have on-site parking and ideally a place where a large work truck can be parked without issue (think fully decked out F-350). 

The plan is to use the heloc to purchase additional properties, and basically brrrr and pay back the balance - then repeat.What I didn't realize is how difficult it is to find a business heloc.  

There are plenty of entry roles from cold calling, scrubbing data and find deals for investors, leasing assistant, work on construction sites, office admin, project coordinator, Title assistant, RE photographer, transaction coordinator.. on and on. 

However, I definitely recommend pictures any time a guest left damage or extra cleaning that will result in additional charges.