So many great nuggets here. I like that you point out that mastering the language must come first, before you are ready to workshop your writing. Otherwise your workshop mates will spend their valuable time helping you with the basics of grammar, which won’t help you master the mechanics of storytelling or poetry writing.
This is exactly right. It's also likely to make people less keep to approach working on your stuff. Better to hit the books and come back in a few months when you're ready.