One of the major issues I see is this.

@Daniel Vo, sent you a message but I am proof that you can start in your late 30's and figure this all out while still serving and setting yourself up to grow even more when you retire from the military.

Check local Facebook groups and connect with local investors who use PM.3.

If it is a private money/ commercial style  lender, it is a relatively simple process.

Highly recommend you looking into a checkbook IRA instead of cashing out.Sure you can take out the principle since you’ve already paid taxes on it but this money is supposed to be for your retirement and in a Roth your real estate can grow tax free, though check with a CPA to see if STR will trigger UBIT in an IRA.

Check out Niche.com

@Eric Helena, There is no statutory prohibition against purchasing from a related party to complete a 1031 exchange. 

My number 1 tip would be to go off market and find owner that wants to sell at a discount / prefers speed and convenience. 

This is critical for protecting yourself, your property, and your neighborhood.Here’s why:Safety Concerns:Skipping checks could allow someone with a serious criminal history—like a sex offender or violent felon—into your property.

That's not even the tip of the iceberg; it's so far away.