Consider utilizing a HELOC for a flip/brrr where you are extremely confident you can turn it around in 6-9 months (max), so you don't hold that 2nd property leveraging the first for longer than necessary; especially with single-family rentals.  

I believe it is at replacement cost, but I am not 100% confident.

Given the location's high demand and appreciation rates, if everything checks out and you feel confident in the repairs promised, it could be a solid investment.

For example in DFW get a good understanding and confidence on the rental cost per unit type and what the sizes get where in the area.

Got my first tenants (traveling medical) and they have renewed 3!

If it is vacant, you feel confident and comfortable with the other contractor after doing your DD AND they have a lower quote, why not give them a go?

Following David Green's Core 4 strategy (realtor, contractor, property manager, and lender) gives confidence to invest anywhere.

My next goal was to make 50k with stocks crushed that one.My final goal is to flip a house to secure a second property but I'm actually lost on how a flip actually works mainly the lending and financing part , I don't want to jump into something I'm not fully confident about if. 

I'm still in early days of building up my business (and my experience... and my confidence), but I think I would be a good property manager if I were to scale.

I'm confident someone with more expertise will offer more helpful insights soon.