The problem is it is difficult to reach retail buyers as a wholesaler. 

Just came from NY here to start career.

I'm close to graduating high school and want to pursue a career as a real estate agent.

What are the areas of Killeen, Harker Heights, and Temple I should stay away from in terms of crime, or just difficult to rent?

If you are 25, I would say: find a career/calling that is rewarding enough that you don't dread doing it, do that and make some money, and strike a balance depending on how much pain you can endure.

Terminate this Contract by written notice to BUYER and, at SELLER’S option, either retain the Earnest Money as liquidated damages as SELLER’S sole remedy (the parties recognizing that it would be extremely difficult to ascertain the extent of actual damages caused by BUYER’S breach, and that the Earnest Money represents as fair an approximation of such actual damages as the parties can now determine) as provided in this Contract, or pursue any other remedy and damages available at law or in equity. 

You've got a great career. 

Fire separation in side to side units is less expensive than up and down units. 1 hour separation is not terribly difficult to achieve.

@Jo Weiss definitely love the sound of house hacking a duplex, Unfortunately in this area where I’m from it’s very difficult, especially going in it with FHA.

Great to see you take that first and maybe most difficult step in real estate investment: reaching out on BiggerPockets.