Let's say you bought a property for $350k, consisting of $275k building and $75k land.

I'm seriously considering trying to find something there, but need to build up my knowledge and contacts of reputable agents and contractors etc.I'm interested in multi-family, STRs, commercial, self storage, and possibly even flips if the right opportunity came up.

It was a new build, shown completely furnished and the builder listed it for use as a STR after we saw it.

It looks like you are doing an affordable build based on the cost but hard to say since you didnt provide info on the build itself such as square footage and finishes.

I’ve had deals under contract where I’ve done building inspections, septic inspections, and had a lawyer look at the easements and then terminated the deal.

Also, would this loan help build my personal credit, or would it only report to business credit bureaus under my LLC?

You have to know the market before you build a plan and I don't think this market supports your intended plan.

One is focused on real estate and its all military folks and vets (I'm active duty Navy) and the other one is focused on being well rounded, while also building wealth and passive income.

I am investor myself, but I’m now diving deeper as an investor friendly real estate agent helping others build their portfolios.

I’d recommend continuing to build equity in your home for the next year or two.