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

Did not know about tools on how screan tenants.

For something more robust, tools like Excel or online calculators from financial planning sites might better suit your needs.Your ROI Formula:ROI = (Net Cash Flow ÷ Total Out-of-Pocket Investment) × 100For your scenario:Net Cash Flow = Annual Rental Income - (Mortgage Payment + 401k Loan Payment + Other Expenses)Total Out-of-Pocket Investment = $40,000 cash + $50,000 loan payments over 5 years.I came across a piece in Bloomberg recently discussing creative financing, and they touched on ROI calculations for multiple loans.Personal anecdote: A buddy of mine leveraged a 401k loan for a fourplex.

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. 

Here are the current tools I have begun looking into. 1.

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

I write and call my local and state political representatives weekly about this.

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Thank for your help Connect with a great property manager or use one of the free online tools to estimate rents.

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