So I would go on different sites like Roomster, FB marketplace, and similar sites like that to see what people are renting rooms out for.

Development projects can vary from a 1-lot Single Family home to 20-acre subdivision, to a 4-acre commercial site, etc. 

Hey @Marc Shin, I agree with those that have said to scour the sites for quality USA made furniture.We have a mix of Basset and La-Z-Boy furniture and it still looks great after 7 years.

I also lived in the more dated unit so I could get better rent out of the other apartment than if it were vice versa.

You'll quickly see why AI is not the solution here... not only will it give you a random number from a site that posted it, but it will hallucinate and draw quirky assumptions into the mix like oh based on this % appreciation and applying it forward/backward, etc.

Two disbursement dates have come and gone without money being added to my account or an email explaining why. 

The only thing that no one else has mentioned is that required by law on site agent?

You can also use sites like rentometer to help confirm your rent price.

Also check out BiggerPockets sister site for passive investments: www.passivepockets.com 

If you keep the footprint of the home the same, you can avoid timely and costly site planning applications in most jurisdictions.