TIAErich  Erich - I would echo other's comments, but also point you in the direction of a Bigger Pocket book, "Estimating Rehab Costs" - It's a 2019 version, so the actual dollar amounts will need to be increased, but it can give you a good starting point for the process that you can refine/update over time. 

I would love to know what you guys would do in order to get this process started if you we're in my shoes.Thanks in advance!  

I process nearly 1,000 applications per year for the last 15 years.

It's literally just a 30 second thought process that gives you a quick idea if the place is even worth looking at.

Love your thought process on it all.

Once you have stabilized these properties and feel more confident about the process, you could refinance these and start doing BRRRRs.

Perform the same task in each app to ensure a fair comparison.Load a property with pictures and details.Market that property.See what your marketing looks like from the public's perspective.Submit a fake application to see how easy the process is.Run a credit/screening report on yourself.Enter a maintenance request, assign a vendor, and attach a fake invoice.Enter charges to the tenant's ledger.Enter recurring charges and automatic late fees.Sign documents electronically.Run owner reports.After testing a few apps, one should clearly stand out.

I'm a project manager and have a team of over 60 contractors that have all undergone a 5 step vetting process.

I highly recommend you read it closely and develop your process.

Quote from @Sarah Albert: As discussed in my book, it's best to address these situations before they happen, because they will happen.My lease has an early termination clause that explains the process and penalty.