Well, banks are usually a good place to start.
Family/friends are an option too, but that usually leads to issues down the line if the project doesn't turn out as well as you had hoped.

Crowdfunding offers some good long/midterm loan alternatives, and has the benefit of getting you some engagement from the investors - but has its obvious drawbacks of people looking to get more out of it than usual.

Can't say this is the most obvious platform to go and ask for financial advice though - best of luck!