Both of our properties have about 100k in equity in them so we were thinking about using getting a HELOC on the duplex rental property and use that money for the down payment on the next property.

Or should I focus entirely on building cash flow and leveraging real estate?

I ended up spending a lot of money on both of these repairs, because I had to get a large portion of the main sewage line replaced.

On some properties (newer) a 40% op ex ratio may be better on other (older) perhaps a 55% to 70% op ex ratio is better. 2.

Here's a detailed guide on how to screen applicants: Application Screening Guide

I figured if I get a decent deal on a turnkey property that has at least 3 bed 2 bath I can prob rent for 2k a month give or take depending on the amenities and make decent cash flow. anyone else have any experience with renting single family rentals in this area?

When buildings like this do come up, it's usually placed on the MLS, but you're gonna need to keep an eye on the market for long stretches of time.

Congratulations on such a successful management company. 

Is it possible to get $2000 rent on a $350k property? 

What is a good target or Cash on Cash Return?