There are sites out there that will perform screening reports at no cost to the landlord. 

You can probably find this on bigger pockets podcasts and just by looking around the site.

Check out socketsite.comLuxury condos aren't doing hot in SF and there's some examples on that site that are interesting.I think the key here is that it's specific condos some of which were likely overpaid and now we're seeing true value but it's more of unique situation then city wide trend. 

A good way to do this is google Tenant Rights for your states and there are usually easy to understand tenant advocate sites that list them.   

Depending on the buyer, repairs will vary drastically due to quality, vision, resources, etc.

The amount you need for the opportunity may exceed the amount you have in the Solo and you've split your resources to the point where you can't do the deal. 

I did ask my lender but I know there’s a lot of experience on this site so I wanted to post it here as well.

What are the best videos / resources I can use to calculate where MY personal number goals should be?

If not thesd particular sites, any suggestions on other sites very much similar to these woukd be great.The are costly so I want to subscribe to the best one.

You'll either meet another investor or a contractor. both can be valuable resources. i also suggest you buy the book by @J Scott on estimating rehab expenses.