Hi Gustavo, it really varries for each person.

House hacking will also give you some personal "property management" experience.

Plus you can call them when they area bottle deep and ask for some personal referrals!

Are there any other expenses that I should be accounting for or any way to verify that what I'm analyzing is a solid deal?

The average person can totally achieve financial independence easily with education, self-discipline, and consistency. 

I am considering keeping my current personally owned home/farm and renting it as horse owner property. already completely set for 2-4 horses. my personal interest rate on the property is 2.6% and I don't want to loose it.

I think that is a solid starting place. 

So instead of paying the bank for a home equity line of credit on my first home and paying them interest, I was able to use a personal loan to myself via my employer 403b and pay myself back with interest. 

Just a FYI you don't need an LLC to do RE investing. if you are looking for the checkbook control then yes you will need one, make sure the custodian you choose explains the prohibited transactions and disqualified person list to you. 

My personal and professional experience has been that they do not provide actual replacement costs in their evaluations.