If you know of any legal entity in TX that can help in a case where GP is not doing their job (maybe a branch of SEC), please let me know.TIA

As Stuart mentioned, there are several issues that might arise with the property, which could definitely impact your cash flow. 

I agree with the other comment, you unfortunately do not get that money back even if the seller was not upfront on an issue. 

Personally, I find BTRs to be more predictable with fewer ongoing maintenance issues, and they tend to attract high-quality tenants.

There are large areas in the direction of the flight paths that do not have dense populations so it’s mostly a non-issue.

Whenever I have an issue/question/problem my emails are always answered same day and a solution is usually worked out within 48 hours.

We've had her for 10 months, she was quiet, kind, when she had an issue with the apartment she would let me know and I would come fix it.

In any contract you don't typically need a clause saying what you CAN do, its assumed you can do anything legally allowed as an owner including sell.

You can legally change or cancel a contract if all parties agree. 

They'll expect electronic payment options.8) Understanding your local landlord-tenant laws, so you don't make a mistake or get taken advantage of by tenant.9) How will you handle maintenance issues?