I will also be paying the $350 a month out of pocket (to avoid interest of line of credit/or should I put it on line of credit)My partner will be doing most of the rehab himself.

I would recommend doing some online research on a list brokerages and then narrow down the list a bit.

People still fall behind on taxes every day and that can cause negative equity situations as well and can be found if the state you are looking into has public tax lien certificates or even just posts the delinquent properties online.

They respond to my online ads, billboard and other advertising. 

Looking for online rent collection recommendations for commercial properties.

You are going to wind up buying a camera, something like simplisafe or if you only need one just get look online for one wireless camera.

Advice you didn't ask for Frank- do an online course that you can learn at your own pace.

What if another tenant also feels unsafe and wants a fifth spot? 

I'd suggest books, podcasts, and low cost online courses.

I would try searching for anything that gives what the GRM is in your market online.