They don't practice in all 50 states but they do have a practice in TX and can advise on how to complete this paperwork and record properly.

Since I have little experience, can you advise on those things that can be overlooked by a newbie landlord like me?

But was advised to also carry umbrella personal liability.  

I would advise to start small. 

It is difficult to answer this without running numbers, I would highly recommend speaking with TrueBooks if you're set on them to advise on this.

I would advise to look at homes that are less than $850k which would mean looking out of that city.

My advise is to start with single family or a small multi-family ground up project first but this market environment is truthfully not the time to be completing any ground up projects unless you are self performing the construction which it doesn't appear you are in a position to do.There was a recent Philadelphia  forum chain started by someone else who was contemplating ground up in a similar fashion to what you are proposing and I cautioned they would be better off buying something that was newly built and believe after conducting their own diligence realized it was too cost prohibitive at this time to build with 3rd party GC's in Philadelphia when also accounting for the interest rate environment and cost to build.

And as far as the relationship advise, is that kinda like saying "hey you know your girlfriend kinda looks fat in that dress, you should probably tell her that" or something along those lines? 

Any help, advise or recommendation would be greatly appreciated. 

@Shahaf MatityahuYou apparently checked with City Planning which zoning is part of, and they advised you it's for only 2 apartments.