.: Hi,Is there a way to download specific addresses for houses in a certain area online?

Most look at a Certificate of Insurance and confirm coverage limits but best practices are to (1) become added as additional insured under contractors policy and (2) understand coverage exclusions which are not going to be detailed on an insurance certificate.

Everything you need to learn/know is available online for free.

Its simple in practice, however you need to make sure the numbers work.

You can also use online resources such as City Data to search demographics in the area. 

Quote from @James Hampton: That's a bad practice to follow.If an occupant is not named on the lease, you may have difficulty enforcing rules or evicting them.

You may not need these, but it's a good practice anyway.

Cold calling is a great idea to get started, but maybe try connecting with local real estate groups or online forums too—they can sometimes have off-market deals.

It seems there’s a common misconception largely influenced by social media, online courses, and influencers who oversimplify the process that real estate is an easy, passive way to generate income with minimal effort.

A lot of education and a little bit of practice is something that one can accomplish with elbow grease.