Selling on eCommerce platform or marketplaces – what would you recommend?

I am a beginner seller and I’m thinking about starting my own website. Not sure if it’s a good idea though, as I’ve heard it takes a lot of time, effort and money to make it work and bring profit. Would my business do better if I start my own store and put my listings on multiple marketplaces, too? I’d appreciate any advice or insight from more experienced sellers. Thanks a lot!