It took me about three years, after improving the units, raising the rents yearly and reducing my costs, to break even.

An application, approval/denial letter, lease, checklist, termination and security deposit notice, will cost many thousands of dollars from a lawyer if he drafts it from scratch for you and, for example, if he is not located in Cincinnati he probably will not be familiar with the ordinance requiring deposit alternatives or providing tenants copies of the ordinances and statutes the City requires. 

Early on, I think people should be more conservative and establish a base (HYSA) and then regular (weekly or monthly) automated investments in low cost index funds. 

I think you got a lot of good things going on as you are your own contractor and most likely be able to cut cost in your rehab..I believe your questions is pertaining to how it cashflows and what are some things to look for as you continue to BRRRR..

IRR estimates are extremely sensitive to the exit cap assumptions.

What will it cost to make those income streams happen?

Looking for some advice if this seems normal for closing costs on this piece of Land my wife and I are trying to buy.

My guess is the S Corp hasn't been kept current...Get a copy of the Trust/will/ whatever you can.These problems can cost a fortune. 

The biggerpockets rental calculator is great, but sometimes the rent estimates are way off.

After renovations, refinancing enables you to pull out equity to cover costs and reinvest.