My husband and I are starting our REI journey and have assembled a team in the area where we'd like to buy (not out-of-state, but 3 hours from where we live now where prices are more reasonable).We have a great lender, got approved, and are ready to buy.

Nevertheless, there is a method to obtaining your answer, and it involves many of the things Christopher mentioned.A bit longer answer is, it requires experience to assemble a team to help determine those costs. 

I really want to turn those properties into Airbnb listings due to promising ROI and no HOA restrictions … The biggest challenge for me is to hire someone on the ground to set it up and coordinate with vendors, for example running errands to pick up the keys from my agent, purchase / receive / assembly furniture, installing smart lock so I can have full control over my property remotely..

In the next few years, I would love to assemble a full-cycle team to acquire, fund, architect, design, construct/renovate and manage/sell properties.If you're looking for a partner, have a need in your business you need filled or just want to chat, I would love to learn as much as I can and meet positive, hungry people in REI. 

Looks like you are.Next, start assembling tools and practicing assessing deals for whatever strategy you're going for.

Like any RE project, you just need to assemble the right team.

Do not depend on reviews from the typical homeowners who might have had a handyman/contractor hang pictures, or assemble furniture, or paint a room.A larger rehab project requires skills and subs that don't come with handymen. 

@Kenneth Garrett according to the PA code, if there is a window within 10 feet of a fire escape, that is changed i.e. removing the frame then it needs to be replaced with a fire rated window assembly.

Construct a new Facade to improve the retail floor for public assembly, build-out a new restaurant on the street floor 2003.

Then assemble a good estimate of dollars you will need to spend on the renovation to get the house in a condition at least equal to the comparable sales.