How do you successfully start an Etsy shop?

I want to maybe try to sell some of my crocheted items. I’m told have a really good eye for patterns, combining patterns, using the right colors, and adding special little details… so I thought I’d give it a shot. I could use the extra cash.

But how does one go about doing this correctly? My “instinct” is always to do custom stuff to whatever the person wants, but I’ll never get anywhere that way. How much do you keep “in stock”? How do you price something accurately? Do you really have to be a Rembrandt with a crochet hook to successfully sell anything on Etsy?