http://www.citytheatrecompany.org/education/yp/contest.html If you scroll down a bit there is a PDF style guide you can use - this is the one I use, at least, I know there are different variations on this (mostly in the size of the indentations of the stage directions and such. If you're submitting it to a certain contest or theatre or whatever check and see if they have certain guidelines for you - if not, then I think this is a pretty good general setup.)
Also, if you haven't centered characters names yet, USE TABS (if you are using MS Word... I don't know if you can do it in other programs.) Set your first tab to whatever you are supposed to indent stage directions to (I use .5) and set it to left and then set a second tab at 3 inches and center. That way you only have to hit tab twice instead of highlighting and hitting center.
Updated On: 1/1/06 at 04:17 PM