A float plan contains the necessary contact information for a trip: paddlers’ names and emergency contacts. It also gives the location of the launch and return, and expected journey and return date or time.
An example float plan in Google Sheets is here. If you make a copy you can fill it in, make it available to others on the trip or remaining on land, or print it.
If you prefer paper, here‘s a .pdf you can print and fill out by hand.