The 50% rule a good smell test, but the age of the properties, the differed maintenance, the utility break down, rent amount, etc will all change the percentage of expenses on income. 

This would be solved by having the online version, but I prefer the lower cost and not having my data stored online.I use Rentec Direct for tenant screening only- they do an SSN verification, credit, criminal, and eviction check for $29.45. 

I have been reading about real estate since I was fifteen but I never had a chance to put into action due to my age; however, this summer I took an internship at some brokerage and I have decided to become a real estate agent.

Be prepared for delays,lots of them.Rain and snow(if any) can ruin the days you had scheduled to repair the roof,paint the exterior,repair or change the landscape or driveway,etc.Also,if you're trying to sell single family homes beware,parents don't normally want to move their children to a new home and possibly to new schools in the middle of a bitter cold winter.Only if you price the home well below the after repair value and give them some instant equity will you get good enough offers to accept.Even in warmer weather states like California and Florida,finding multiple offers from families with school aged children can be difficult.Be prepared for the home to sit on the market for 90 days or more until it gets closer to the end of the school year.

But, I can't disagree that a buyer should always go through the financials as thoroughly as possible,  so additional verification may be needed. 

I personally struggled with this issue myself at your age when I first started investing in real estate, so I'll briefly share my take on this issue.

Washer and dryers are must this day and age correct?

@Devang Vora Capex depends on a few things to my understanding; how long you plan to keep the property, the age and state of any of the big ticket items, etc... 

You are in a great place - steady job, great credit score, no liabilities, nice amount of savings and are learning about the business at a young age.  

It depends upon the recent renovations and age of key property infrastructure.In general, based on the assumptions below and in the absence of more detailed information, it feels like the rent is overstated and the expenses are understated.