To answer your questions:
HOW TO MAKE A GROUP:
*Go to the "Groups" tab at top of dA with the orange and white house. Next click at the top "Make a Group" it is a wide orange button. After clicking it you can continue from there and as soon as you submit the rest, dA will pend the group and then voila you have a group! <3
HOW TO POST LITERATURE STORIES TO DA:
*Go to submit art. Go to Categories and then go down to "Literature". Click "Prose" and then if it is a nonfiction story, click on the main genre, point of story, etc. etc. that your story is and if it is a fiction story, click on the genres that your story is under and then click introductions and chapters since a story will be submitted per chapter ^^
HOW TO SUBMIT A LITERATURE ART PIECE TO "THE CHOBITS FAN CLUB":
*Go to gallery Folders and then submit the piece under "misc."
Happy to help <3