Welcome!
FL Studio is often known for being very beginner-friendly. If you have a mac, you might also try Garage Band or Logic Pro.
Here are some more options, but might be less beginner-friendly:
Thank you so much! :D Update: I just realized I can't afford the full FL Studio version but that the free trial doesn't let me reopen my saves...is there a workaround?
As far as I know, the only workaround is to keep FL Studio open until you finish the project. But this is suboptimal for obvious reasons.