It is not like selling a car. Place ad, sell bike, hand bike over, clean up space in garage for new bike. It is pretty simple.
Just a warning Craigslist can be a cesspool. Between the scammers and low ball offers and the no shows, you will lose all faith in humanity. Follow the advice from dedhed, it is good. If you are on Facebook, list in Market Place. Here people tend to be a little nicer because they aren't anonymous.
Good luck.