Just be prepared, have your W2s, any tax returns, and bank statements. 

Surely you will have the lease reviewed/prepared by a real estate attorney and consult with a tax professional.

I worked for RPM Wichita from May 2015 to November 2015 to help me prepare and learn more about property management before my fiancé and I opened our own company.

To me, "negotiating strategies" has the connotation that you are preparing for a fight and the main objective is getting the lowest possible price. 

I recommend doing the math yourself as it's a very good idea to be prepared at what costs and income you will have. 

Did a little search on the best sources and I found this website to help learn and prepare myself.  

As the old saying goes, luck is what happens when preparation meets opportunity. 

But good deals pop up in any month and you need to be prepared to jump when the right one comes along.When you apply for the loan, the bank is going to want to see two years of tax returns as well as proof of income.

So I have not begun investing yet, but hope to as soon as possible.I hear from a lot of investors that they buy their first property, and then have trouble securing loans for the next 2 years, because they cannot coun...

I'd recommend 2 steps:1) Prepare some simple documents (clear and concise) that describe who you are and what your RE investment strategy is.