I’d suggest Shopify or an equivalent if you’re trying to set-up an online marketplace! It has tons of templates to help you with the design aspect and automations that take a lot of the guesswork out of operating a small business. There’s still a learning curve, but it is muuuch easier than trying to build a website from scratch and there are tons of resources/support available through the community forums.
Growing my audience online! I’m an artist and I make the majority of my connections/sales through Instagram, which has been a nightmare to stay relevant on. It used to be SO easy to grow my following when I first launched in early 2020… now it feels like the algorithm is endlessly working against me and only lets up if I give it those sweet, sweet ad dollars.