Can anyone recommend a reputable realtor that has some good knowledge of the area and can provide some insight on which types of houses renters are moving into, and which homes people are buying in the area and why?

I will say, those houses, you gotta know the streets, the reputation, and decide how nice you will make it to determine what type of tenants you'll get.      

Katy ISD is reputable

Would anyone here in Atlanta be able to recommend a highly reputable Real Estate Attorney?

I will be doing most of the rehab myself but I will need a reputable HVAC mechanic and painter.

You could potentially team up with a reputable local wholesaler/company and allow them to perform ALL of the work and share the spread with you.

@Ali Boone I would be very interested to get your recommendation / feedback on reputable turnkey companies. 

@Sam MillerWith a relatively small number of reputable providers across the country, choosing the right firm to work with usually involves going outside one's local area. 

Does anyone know of a reputable and experienced operator in the Los Angeles area that might be able to help?

If you go No. 1 it sounds like maybe you need to do a bit more due diligence on reputable companies if your current investment closed pre-rehab and had an above-market price tag.