How to practice the math for real estate investment?

[David Yee]

Hello! I'm hoping to purchase a rental property in the next year. I read the Book on Rental Property Investing and am reading various articles on the matter. I'm ready to start practicing the math associated with analyzing properties. How do you suggest I go about doing this? Should I just start finding properties on Redfin and performing the calculations called out in the Book on Rental Property investing? I don't know if it matters but I will need to look at properties that are outside of where I live since San Diego is very expensive.

Thank you all in advance!