Finally, something I'm good at.
Many writers work alone- I do, I find it saves a lot of time arguing. There are others who swear by team development. This can be useful if you have a lot of characters who need developing beyond a one-dimensional, one-liner personality. If you do work in a group, be prepared to compromise like hell. Don't even expect all of your ideas to see paper. Another reason I write alone is just that; this is my art, and for better or worse, I want it judged as the creation I envision.
Groups can kick start your idea motor. Groups can teach a lot of different writing techniques. If you're out of creative fuel that day, someone else at the table may take up your slack, if not inspire you. However, know that in the vast majority of groups, there is a clear leader and several people who contribute small chunks of story.
So now we come back to working alone. This is my completely non-logical meathod of storytelling, writing poetry, drawing, or most anything else that requires creative visualization:
And then learn to take criticism.