What's the best piece of advice you can give someone just starting in multifamily real estate investing?

We file jointly, but I want the investing to be my business in my name.

The best protection for you and your investments?

If I invest a multifamily through a Roth IRA, will I still receive the same tax benefits as I would with personal cash when I file my tax return?

Beyond that there are hard money lenders who charge higher rates to take on more risk... but they again start by looking at you, your skill set, and your previous experience in both managing your credit, as well as your real estate investment history.  

This isn't STR, this is any form of investing or daily work(non REI related).

Those are not the only states but they have been a very Hot market lately.You will find a better price to cash flow ratio in those states due to multiple factors. 

A competent PMC will simply rent your property to the best tenants -quickly- and they will charge a nominal fee to manage your investment property with competence.

And by investing it somewhere it hopefully grows more than 5% per year- I have the possibility of having enough to pay off the mortgage even sooner than my original 25 year timeline. 

It isn't much yearly for a pure investment property.What will it bring in as a LTR?