As others have recommended, I would suggest looking at starting with buying a primary home with your VA loan - whether that be a single family home or a multi family. 

I’m curious if anyone would have a recommendation for lenders that offer second mortgages in Texas.

I don't do conventional lending, but I suggest contacting a conventional broker to see what options are available for your goals. 

Your offer to purchase should include a requirement that the Seller provide all documentation and agree to sign an estoppel certificate (also called an estoppel form or agreement).

As a fellow investor looking to expand my portfolio, I was intrigued by your offer to assist in sourcing potential deals in the area.I've been actively educating myself and analyzing investment opportunities, with a focus on buy and hold multifamily and commercial properties.

I always say to go follow different people that offer STR masterminds/courses on social media, and whichever one clicks for you and has similar goals consider joining the group.

I offered asking price due to multiple offers being put in How did you finance this deal?

I've seen individual municipalities offer those same protections despite the state not offering them. 

I received an offer that is substantially higher than my asking price from a retail buyer, but the buyer would have a mortgage and need a warranty deed.My attorney reviewed the title search and the county's notifications to lienholders and doesn't see any issues. 

That would be my suggestion.