But that’s okay - this is just one premise. (It may even be your first, I don’t know.) There are lots more where this came from, right? Follow it through, finish it off, seek advice, polish it - but in the meantime, keep writing down your ideas for new works as well. It is part of the process of being a writer, and every writer has to accept that the first project may just be the one where you work a lot of ‘craft’ stuff out. Maybe even the first few…
I don’t mean that to sound discouraging - it’s a way of saying that the writer you become is more important than the writer you are when you start out. It’s one of the hard things about writing - musicians, dancers, athletes all tend to start out when they are kids, and they create and improve without self-consciousness. Writers tend to start out later in life - teen years or older - and it’s harder balance the rate of improvement vs. the ambition of the dream.