In the corporate side of my career, I've been part of five rebranding/brand evolution campaigns. As crazy different as each was—more unalike than I am from my sister, and lemme tell you, that's a ton—the one commonality was that each new branding required a thorough style sheet.
Similar to, and some cases an extension of, style guides (Chicago Manual of Style, AP Stylebook, MLA, APA, etc.), a style sheet is a more concise document that serves as an in-house style guide, usually supplementing one of the larger style guides such as those I just mentioned.
Image: style sheets icon
Why am I telling you this? What do style sheets have to do with you?
If your writing is lengthy or public and therefore will eventually involve a proofreader, please do everyone a favor and create a style sheet listing your preferences.
Early in the movie Eternal Beauty, Sally Hawkins' character is fed up with receiving Christmas presents she hates. So she buys and wraps the gifts she wants, opens them in front of her family, gushes over how perfect everything is, and hands each "giver" a receipt for reimbursement.
By creating your own style guide, you are giving yourself the gift of deciding exactly how you want everything to appear.
Style sheets ensure consistency in voice, punctuation/capitalization, spelling, vocabulary, and the like—i.e. everything in your draft that might not always be represented in exactly the same way. You can easily search your own manuscript for these items, and your proofreader(s) can easily follow your style sheet to ensure adherence to your preferences.
Want to see samples? Google "editing style sheet templates" for tons of inspiration on formatting and items to include. Most are free—no gift receipts required.