Wanted to get some thoughts from more seasoned small multifamily investors on a few items or any other suggestions:- Any specific pros/cons of any particular states in SE (TN, AL, GA, NC, SC) to consider?

Section 8 would tend to carry higher repair and as a result, additional vacancy.OP’s definition of cash flow is rent minus piti.  

Some may have very small thresholds for repair holdbacks on purchases but this is typically limited to make ready items not to exceed $2,500 in costs to cure.

If so, are you concerned about Spain's tax system on worldwide items?

., property management companies aren’t legally required to carry general liability insurance, but it’s highly recommended for protection against bodily injury or property damage claims.

Do you know where I could find/access lists of seller carry back notes?   

I think you're confusing the quantity of items with curb appeal.

Freddie has a reno loan product that can be used for investment properties; this is only for first position, though.For the Heloc - it goes back to whether your mom wants to continue carrying the loan for income, and if so, how will you pay off the heloc once the rehab is complete?

They make ordering items from different companies easy, and you get discounts from each store that has partnered with them. 

I would certainly advertise that and add pictures and themed items to house.