Or, they flip homes, they are agents, they offer client remodel work, etc, so not specifically flippers but dabble in a lot of real estate related areas.Or, the full timers that started as flippers have since moved into new construction work more than flipping. 

You manually dial until you start making money. 

Hi Gege, I would recommend listening to some of the podcasts from BiggerPockets, they really help a lot when you are getting started.

I hope you've already made progress in getting started as an investor.

Build out the network for GCs in your area and start to bid jobs, then you can build out how much each job would cost.

This past year they have started paying rent late to the point where the total accumulated time is about 3 months of back rent due.

You'll need money for: closing costs, down payment (if any), operating capital to get the construction/rehab started (most HMLs reimburse you in draws for the work completed), along with some liquid reserves on top of that.

If you are managing this yourself, you are off to a great start.

I have been working with many people who are just trying to get started with real estate investing.

I started with a property management company.