How do i make an insanely rich character that is fair and balanced to play?

I want to base my character on my all time favourite character in all of fiction: Scrooge McDuck. I want to use his backstory. Simple “started out poor but became rich.” honestly worked his way to the top by being a business man who funded a lot for the city he lived in, owns several businesses, and is overal INSANELY wealthy. No he spends his retired days enjoying his wealth and adventuring to find magic and valueable artefacts so that he can add it to his collection, all while fending off demons, bad guys and monsters from stealing his money. Also wanna do something with the “lucky first dime” but what i wanna do with it i don’t really know yet.

Thing is, having a character with an insane amount of money is pretty unfair early game. Just buy all the best weapons and you don’t see a dent in your money bin because you’re insanely rich. How should i balance this out and make “being filithy rich” a fun thing my character has instead of a game breaking exploit?