You can use Airdna & other STR estimator tools to get data on potential income/vacancy based on your location and property size. 

With expert guidance, tailored training, and a supportive community that will align you with the tools you need to fast-track your success and avoid common pitfalls.

He even made a tool for financial analysis.

There are a lot of books on note investing, which is essentially what you're talking about.

Did not know about tools on how screan tenants.

Essentially you are creating future tax free income by being able to roll over these losses.If your income is between $100,000 and $150,000, a portion of that $150 loss is deductible and the rest rolls forward.If your income is less than $100,000, your loss is fully deductible - and THAT's the cool thing about rental income. 

Setup all business tools like a CRM, MLS access or RE software suites a webpage digital business cards a Facebook business account. 

Don't exactly use the price Rentfinder.ai gives you, but use the comparable tools they have and the other prices listed.

They are one of my favorite tools. 

There are rental management tools like Stessa, Baselane, Innago, and many others that include income/expense tracking that handles all the accounting tasks and reporting you really need for rentals.