I am choosing to turn my current primary into a rental in TX, and possibly moving to AL.

Having an LLC is not necessarily a requirement, but may be prudent move based on your intended activity.

I actually have done personally exactly what you're describing - HELOC on primary residence, use that to purchase new primary, move into new primary and rent the previous home(4 times in 5 years).

Sometimes it’s another week until move in. 

While I'm just starting out, I'm committed to learning, growing, and making smart moves in this dynamic field.

That's a strong earnest.I see way too many buyers and investors trying to put like 1k or 5k down prior to close, but that is no skin in the game and will not get real sellers to move.

Whenever I find a job or opportunity in Austin, I plan to move there.  

Just moved to Florida want to learn more about its market and other states as well.

Moving forward we are exploring possibly combing households due to the large size of the property and the difficulty of upkeep but there are several questions/ issues that need to be addressed so it does not put either of us in a compromised position.When her husband died a friend paid off her mortgage due to it going into foreclosure ( 210k total).

That way, you understand all the moving parts and can add the specific data you want to evaluate.