How long should your mortgage be for a rental property

[Yacoub Shack]

Hi looking to getting my 1st property. I’m trying to understand how long should my loan term be I have been pre-approved for 30-yr loan but don’t really understand how it will make money. I know to make sure the rent covers the mortgage and try to get cash flow on that but with that being said I won’t really make any money into the 30yrs up. Help me understand where I’m wrong or what I should be doing.