What do you want to sync - music, apps, films, bookmarks, ... ? If you haven't got iTunes installed on your computer then you can download it from here.
Syncing with iTunes : http://support.apple.com/kb/HT1386
Syncing music : http://support.apple.com/kb/HT1351
Syncing photos : http://support.apple.com/kb/HT4236
Syncing apps : http://support.apple.com/kb/HT1977
Connect your iPad to your computer using the USB cable it should show up in iTunes once you open the program then in the right hand corner you should see e.g Sean's iPad then in the tabs you should see music photos etc click what you want then click apply at the bottom of the screen.