Readers are advised to seek professional advice.

I'm seeking actual rates and fees people are paying for their money. 

If you are younger and seeking to rapidly build a cash flowing portfolio, if you are wanting to continue 1031'ing into bigger assets, or if you do not have the cash to take down entire deals without financing, leverage makes a LOT of sense.If you are retired (or rapidly approaching retirement with a level of uncertainty or concern about what your post-retirement income will look like), it could make sense to begin paying off properties so that you reach a point where your expected monthly cash flow will exceed what you need to live comfortably after retiring.

Seeking some knowledge and experience from others that have been doing this for some time.

A prudent investor doesn't seek quick riches through shortcuts.

Readers should seek professional advice.

Mindset is key and just know that this is a business and you would be actively seeking clients and every day you wake up your working for the paycheck you receive in 30-60 days.

I'm not sure if I need goal seek or it can be done with an equation.

Any contractor who seeks those terms will be out of business rather quickly.

Readers should seek professional advice.