In my case, I have residential rentals in one LLC, commercial properties in another, self-storage in a third, and my real estate company operates in a fourth.

To answer your last question, my realtor has contractor contacts I should be able to leverage for rehab budget estimates, as well as family friends with experience in the construction trades.

You'll need to hire a title company to find out. 

I know the larger companies around here were charging up to 25% but it will probably vary no matter where you are at.  

The days of using Kitchen and Bath companies for the cabinets and countertops in your flips are over.

There are a ton of free tenant applications online and through property management software companies such as turbotenant, rentspree, zillow etc.You will want your application to meet any state specific guidelines (if applicable). 

Probably every dialer company has lists they can sell you.I think it is better to call yourself vs using cold callers. 

Most PMC's will add extra fees to help the company make some extra revenue.

Best case, you learn a lot, survive financially and trade up.

@Benjamin LarabeeI'll be honest - most bookkeeping companies are not worth the money, so vet them carefully.