My calling script is just my cues as well - I generally run two prompt books, one in rehearsal where I write down blocking notes and other info, and one for the show itself which is just cues as I hate having a cluttered calling script. Whether you have a set or not shouldn't really have much impact on the format of your prompt book, except that for blocking purposes I sometimes stick a miniature version of the set plan onto each page to draw blocking; as well as writing down "Sally x DS and sit on chair", I'll put an S in a circle on the plan where she started and then draw an arrow to her new position. Thomas A. Kelly's book A Backstage Guide to Stage Management has a good section on The Rehearsal Period which includes some great information on prompt books - like me, he recommends having two books. The layout of a prompt book is very personal and I don't think you'll ever find two stage managers who do their books exactly the same; I always have script on the left and cues/blocking on the right, but my two colleagues are the opposite. For a musical, I merge script and score for a calling script, some SMs prefer just to have the lyrics of the song and counts of 8 for dance or orchestra breaks. Provided you do the basics thoroughly, there really isn't much right and wrong when it comes to prompt books.