First you need to choose if you want a calender with one month per page or all months on one page. The monthly-calendar will give you a few extra options, like a colorfull image at the top, but the full-year-calendar will help you to find dates several months ahead.
Both types of calendars will give you week-numbers and moon-phase, and they are all freely available on this site.
All PDF-calendars can be customized with moon-phase and weeknumbers and first weekday before you download it. To do this, click the blue buttons which you will find right above download-link.
If you intend to print the calendar, be sure to select the same papersize for the PDF-document as the paper in your printer. The rule of thumb is that The US, as well as Canada and parts of Mexico, uses Legal or Letter papersize.
The rest of the world do A4 and A3 which is the most recognizable A paper size, though it’s taller and more narrow. Not sure? Measure your paper in millimeters or inches.
The ISO week date system, as seen here as weeknumbers, is a calendar system mainly used in government and business for timekeeping. So, if someone says, "I´ll deliver the goods in week 21", everyone knows when to expect the merchandise.
Weeks in this system starts on a monday, so always print a monday-first PDF-calendar when you use weeknumbers.
It will be your first calendar-month.
Choose year and go to your printable calendar.