I had belatedly realized that FHA goes off personal credit and therefore I couldn't use the LLC for it.

Do you mostly rely on your property management software, or do you have additional processes in place to keep things running smoothly?

It may be worth letting them know about the prequalification requirements (credit score over xxx, salary above xx,ooo/year, etc.) in advance to weed people out.

Is there a way I can "co-sign" with one of my parent's credit cards and be on their credit history in order to boost my credit score? 

You pay your agent at closing (think of it as an additional closing cost) Depending of the situation and of these options can be used by you and your agent to negotiate with the seller.

As a backup plan, if I have to go with a local PM company that only leases the entire home, could I use an addendum to add additional tenants to the existing lease while ensuring everything is legally structured?

When you say that you will "screen" prior to showing, does that mean a full application with backrgound and credit checks?

Take stock of your current credit score and accounts.

Since your name is on the deed, you have a few options to secure financing for the rehab:Home Equity Loan or HELOC – Since the house appraised at $500K and you own it outright, you may be able to take out a home equity loan or a home equity line of credit (HELOC) based on the home's value.

The teacher was an actual financial educator but they repeated themselves a lot and were telling the students to go in and apply for credit cards DURING the course to purchase the next course for $15,000!