Access is always an important factor too. 

I would like to sell my property and put 100k down on my first apartment building for around 1,000,000.My question is is this a realistic goal?

At the apartment complex where I worked (in CO), we replaced the carpet in the units after 5 years due to normal wear and tear.

She didn't make any of these requests prior to her signing the contract, after the contract, she brought her sister in law, her daughter, and everyone else there was giving her advice as to how to "improve" the apartment. 

On August 18 I am ending my lease so I can rent a room instead of an apartment to save money and pay down debt so I can be in the best position for homeownership next year.

The first guy left without issue after the tenants realized they were going to lose their apartment; the second is tbd.When I get unauthorized tenants, I write a very short and simple letter stating that everyone has to be on the lease and pass a background check.

maybe join the Texas Apartment Association for a couple hundred bucks which allows you to use their lease. it's pretty comprehensive.

They also might get nervous about the access to all that open credit (if you keep it open)....

I am currently reading a book that the author was doing his research that apartment buying and selling was the number 1 real estate investment in real estate. 

I’m currently looking in Mobile to buy, just because of access to limited capital.