Experienced, but need help to create a "calendar" database

[Penny Meholick]

I need to create a database to track the rental of motel rooms. The user
would click on a date to reserve a certain room, and check customers in/out,
and keep track of payments.

I've created many databases before, but I'm at a loss how to begin one that
is based on a calendar of days.

Can someone point me in the right direction to get started? Maybe an
example to base it on?

Thanks!