Hiya Skinny! Google
"USCG 6-pack captain
license". Among the requirements, keeping a log of your sailing. There is an official "log form" that you can download, then use after completing a cruise
; print a bunch of them. All info needed, is on the log sheet. Definitely, log all your trips as you'll eventually need to provide the "mileage" sailed. While browsing the USCG web site, it may not be a bad idea to start getting/earning the suggested documents. Sail away and have a ball!