As someone who has had to keep a LOT of logs in my professional and personal lives, I recommend looking at various options online. Any logbook being sold should have a sample page for you to look at. Use these sample pages as a prompt to determine what info you want to record, and what you don't. Then craft your own "perfect" page in a word processing program, and take it to a print shop on a thumb drive. Have them print as many as you want in a book and bind them for you.
Look at mariner's logs, pilot (aircraft) logs, scuba logs, trucker's logs, taxi logs, dispatch logs of all types, etc. You'll soon get an idea of what works for you and what does not. Having a form ensures you won't leave anything out accidentally, but having YOUR form means you are not paying for a page that asks about stuff you don't care about, like your last pump-out if you have a composting toilet. This seems like a small thing, but every blank that you never make an entry in has taken away a small bit of space on that page that could have been used for that catchall "Comments" section, for cool stuff you saw or did.
This approach also lets you determine the size of the page, and therefore the size of the logbook, which is perfect if you have a special nook where the log is stored. You will likely save money over the long haul too, and the printer should be able to emboss your name and/or the boat's name on the cover of the log, which feels kind of luxurious, IMO.
