Do yuo have a PC or is it a Mac you connect to?
You have to select those items to sync in the info tab of iTunes when you sync your iPad.
Connect the iPad to your computer.
Select your iPad on the left side under the devices heading.
Click on the Info Tab in the iTunes window on the right.
Click on the Calendars, contacts and email accounts that you want to sync to the iPad.
Click on Apply in the lower right corner of iTunes.