I have previously recommended creating your own style sheet to aid you when you are proofreading. If you aren’t sure where to start, I have produced a sample to help.
The layout is the same as the one I use when compiling a style sheet for the projects I proofread. All my non-publisher clients get a copy of the style sheet for their own reference once I have completed proofreading.
The sample is for a made-up project, but it should give you an idea of the things to consider. I have also included some formatting and layout elements you would need to think about as you get ready to publish (e.g. chapter headings and page numbering).
I would advise recording the decisions you make as early as possible (particularly the basic ones such as is/iz suffixes and single or double quote marks). If you do create a style sheet and later employ an editorial professional, send them a copy. It’s really very helpful!
I have uploaded a blank copy of the style sheet for anyone’s use (although if you share it I would appreciate a link back to my original). The sample is for a novel, but you can make adjustments to the blank copy for any writing project.
You can find the sample and the blank style sheet on my Resources page or download the sample by clicking this link: Sample style sheet.